It is not at all surprising, reading the very strange opinions shown in this thread, that people disagree about actors. Interesting that most of those who are 'undeserved' according to the OP are women.
Halle Berry only got an award because she is mixed race? Kate Winslet was only in a supporting role in The Reader?
Even Marisa Tomei gets moaned at, without any consideration of the fact that she was absolutely brilliant in that part, and funny. OK she had a good part, but she did it beautifully and nobody else was as good that year.
Humphrey Bogart not deserving an Oscar is just the most plainly daft thing ever said.
Listen folks. Give your true real opinions instead of trawling the web and giving 'opinions' you have nicked from others.