is there a limit to unrealism in games?

[SvennoJ]

No limits, see noby noby boy and Katamari damacy. It is a plus when a game is consistent with it's own mechanics and No Deus ex Machina crap like the end of ME3 please.

Unrealism is fine, what bothers me more is when your character is suddenly made helpless to advance the plot. The unwinnable boss fight crap, throwing everything at it, yet since the boss is supposed to escape it ends just before you win. Even worse when you're supposed to die at the end, but if you die 1 second too soon it's try again.