Bowling and Golf.
Tennis ticks me off many times. At seemingly random points, and well-timed stroke ends up somehow being a complete whiff. And watching the replay of it just solidifies my belief of "WTF???" And I absolutely hate the ball control on it. I don't play tennis, but I play table tennis, and the backwards ball control drives me insane. I undercut to make the ball go faster? How? Why? That makes absolutely no sense at all!
Boxing is just random. About the only thing that ever works correctly is the fact that the correct arm comes out. Landing a punch in the right spot (or many times even in the general spot) can be frustrating. Hooks are difficult to trigger, and uppercuts...just forget about it. Unless someone has some pointers on what they do to get hooks and ucuts consistently...I'd love to hear 'em.
Baseball's just kinda cheesy. It's a little TOO simplified.
It's a decent game, and a great pack-in, but it's got some serious faults in my book.