Since you liked the QTE's in RE4, it's a BS fanboy alert when someone else doesn't like RE5 QTE's? That doesn't make any sense, so I'll assume you meant that people who liked them in RE4 should feel the same about RE5, right?
Well I didn't like them in RE4 either. The only thing RE5 did worse was add them at the most random times, when you were least expecting it in some cases. Was it fun for me? Hell no, all it did was make me watch the goddamn cutscene over so this time I could randomly press a button to continue. In the case where I get a QTE out of NOWHERE way after the last boss is dead, miss it, and have to redo the entire last fight is just complete bullshit in my eyes.
Secret of Mana was an amazing game, and the only time I ever played it was with my other friend. I can't remember what the third character (controlled by AI) was doing, but it must have never been very annoying because I don't remember it being annoying.
It seems that a lot of people understand how to use Sheva, but in my mind that's not something I feel like burdening myself with while playing. I don't know why, I just don't like it. Online co-op is great, but so many other games do co-op better in my mind that when this game has nothing else very definitive about it, I might as well play those other games like Left4Dead.
EDIT: Ah I haven't tried Mercenaries yet, my friend said it was great, but it doesn't sound like fun to me at all. Maybe I'll check it out later. is it single player, single play with AI Sheva, or multiplayer?