Why do so many people hate on the hulk CGI

In my opinion, there are only 3 places where the CGI doesn’t look great. First is when Blonsky is talking to hulk; his face looks flat as if it was 2D. Second is when the chopper flies in; it looks like it’s from GTA. And third, the beginning of the cave scene; for some reason, while he’s in first in the cave with Betty, there’s a lot of light on the front of his body when it should be only the back, but then this changes and it looks fine. What is your opinion?