I'm not a big fan of health bar segmenting, but I agree that boss move sets should be more varied. I'd prefer that they simply react dynamically to player input.

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Up front: I'm a level 19 and have not yet played on Mars at all.

All bosses I've played up to now have essentially followed the pattern of shoot, move and, if you get too close, stomp/crush. That's it. The most varied one was probably Sepiks Prime, simply because he throws a teleport in there. Sure, the Vex boss in the strike on Venus has a shield screen, but all that does is slowly rotate around it; it doesn't intelligently use it to defend itself at all - it's just there.

I fear that on harder difficulties the only challenge will be not dying by doing something rash simply because you were trying to change up the fight to make up for the lack of boss variety. I actually have way more fun in killing the adds that occasionally pop up than the bosses themselves, especially now that I've unlocked Blade Dancer (That super is amazing btw!).

I hope something can be done in the future to give boss fights a real reason to exist.

EDIT: This is one of the very few critiques I have - I am loving this game and playing with my mates has made it addictive. My sleep hours have taken a big hit.

1. Each boss should have 12-15 potential forms /attacks. As it is now, they all have one and just do the same thing all fight.
2. Divide the boss' life bar into 4 segments.
3. When a segment is depleted, the boss switches forms / attacks.
4. The four forms / attacks per fight should be randomly chosen from the pool of 12-15

This would not only alleviate the tedium of individual fights, but this would also make replaying strikes much better. You might face 4 forms / attacks you haven;t seen before, so it'd be like a new fight. You might get 4 easy forms and have a quick victory, or you might get 4 hard ones and have a wicked challenge.

The tedium of strike bosses needs to be dealt with in future expansions. This would be a great way to do it while still having long fights, and as a bonus make replaying better.

I really don't like that idea, at least how I interpret it--it sounds immersion breaking and artificial. I would rather the bosses have a larger pool of behavior and attacks that they could use at any given time during the battle. Sure, they can get more aggressive towards the end or something, but 4x 25% forms/attacks sounds really old school 3D adventure game.

1. Each boss should have 12-15 potential forms /attacks. As it is now, they all have one and just do the same thing all fight.
2. Divide the boss' life bar into 4 segments.
3. When a segment is depleted, the boss switches forms / attacks.
4. The four forms / attacks per fight should be randomly chosen from the pool of 12-15

This would not only alleviate the tedium of individual fights, but this would also make replaying strikes much better. You might face 4 forms / attacks you haven't seen before, so it'd be like a new fight. You might get 4 easy forms and have a quick victory, or you might get 4 hard ones and have a wicked challenge.

The tedium of strike bosses needs to be dealt with in future expansions. This would be a great way to do it while still having long fights, and as a bonus make replaying better.

This is a very interesting concept. I like the idea, but randomness tends to put me off from games a lot of the time. I understand why you make that point though, because that would very effectively increase replayability. If it was implemented well, with very clear cues to show the player what forms / attacks the boss would have, it could be quite interesting and fun. I'd love to see this implemented in a game so I could try it out for myself. I do wonder how feasible it is for development though. To be fair, I have absolutely no idea what that sort of thing takes in game development. :)

Ever play Majora's Mask? The final battle involves some separate forms. Just when you think you've got this guy beat, something even crazier happens, and he gets even harder.

Just to be clear, I use the term adds in this post. Adds are extra enemies that appear during the boss fight that aren't the boss character. I've also only done three of the strikes, hoping to change that soon.

Sepiks Prime
This fight focuses on controlling adds so Sepiks doesn't go into a wild rage and destroy the players.
-Lower health a lot
-Make adds spawn on a timer (45 second to one minute)
-Since in the lore Sepiks Prime is supposed to be able to absorb souls, make him able to kill the adds that spawn to regain health and get improved attack, defense and speed for a short time
-Can chase the player around a little bit, since his close range attack does a lot of damage

Unchained Hive Ogre
The fight would focus on players managing their damage so that the boss doesn't always attack them and it constantly has to move about the room. Berserk mode is when things get hectic.
-A lot less adds
-Separate fight into three phases
1. Ranged phase - Slow moving, primarily uses eye blast, telegraphs eye blast a lot more but it does more damage, getting close causes the AoE ground slam
2. Melee phase - Starts when 50% health remaining, moves faster, targets player that did the most damage to it during the last phase, switches targets to player that did the most damage during last attack, uses eye blast on players who are out of reach
3. Berserk phase - Starts when 10% health remaining, moves very fast, switches between eye blast and melee targeting, bigger ground slam

Hydra Boss
This fight focuses on cover, and moving from cover and avoiding that giant AoE. More adds makes this fight more difficult because they might push you out of good cover into open terrain.
-Less cover
-Cover occasionally disappears into that fulcrum state
-More adds
-Every minute and/or quarter of health down, goes into an impenetrable shield and causes a large AoE attack that instakills, players must find cover in order to avoid the damage