Red Faction: Whatever that woman's name is. Beat that game many, many times, and I still can't remember any of the characters' names because they're all so unmemorable. Especially the grand finale- she uses the same shield as the only other boss guy earlier on, but now you have much better weapons. Two shots and done, then perform the world's calmest bomb-diffusal and you're done. Such a let down for such an interesting game...Though the 'mutant' enemies and plotline were utter rubbish. Rebellion was really cool though.
Crysis (1/2/3): My favourite series of all time. Way too much time spent on both campaign and MP, and I regret none of it. But their final bosses? Utter rubbish after such a tense, powerful game. First one looks like it's gonna be an incredible boss fight- big exoskeleton dude who wrecked half the army has mounted your aircraft carrier and nearly everyone is evac'd or dead. There's a nuclear storm wracking the air. You take up a minigun and railgun and fight long and hard, slowly blowing his armour off and eventually destroying him. You think all is well and fine. Triumph at last- but not for long. Then, the true final boss appears...And you wait for him to come into range, auto-target him, shoot, kill the few enemies that spawn, then repeat. I don't remember him even attacking. Crysis 2 was mildly better in that the last fight on NYC's own Angel Island, after an incredible battle across the city against man and beast, where even the bad guys join the cause and it's all glorious and you're the spearhead of an enormous army racing against a nuclear strike from the Pentagon. You fight through hordes of the toughest enemies, destroy their enormous generator thingies, then you reach the final tower and...Oh...It's...4 enemies. Tough, fast, stealthable enemies, yes, but nothing your godly array of weaponry can't destroy in a second or two, even on supersoldier difficulty. Such a letdown after such a good level. And finally, Crysis 3...Not as good as 1 or 2, in my opinion- just tried way too hard to be something new and ended up being alright, not amazing. Final boss is...A drill? A three-headed, glowing drill that occasionally speaks to you? I don't even know. It was an easy, boring fight that would have felt much more at home in a sonic-esque platformer. And that disappointment of a boss was the end of the series, which blows.
Darksiders 2: You fight tougher, cooler, and scarier enemies throughout the entire game- why is the last boss a little arena match between you and someone slightly weaker than you? By the point, you've mastered dodging and it's an absolute cakewalk. Not the boss I was looking for after literally travelling to hell and back. Not to mention heaven and earth.