You don't expect to get a good script with witty dialog and good storytelling in movies like this - and you don't get it. You don't expect the best and most convincing actors in the world in movies like this - and you don't get them. Woody Harrelson being the only exception. You probably don't expect the best editing, lighting, costume designing etc. in movies like this - and you don't get them.
You DO expect overwhelming visuals in this kind of movies - you get them partially. You DO expect thrills and suspense and surprises in this kind of movies - you don't get them.
Roland Emmerich artfully manages to make watching the end of the world in monumental pictures a thoroughly boring experience. Why? Because this film never touches you in any way. The main characters remain shallow throughout the whole 158 minutes. Some are just not interesting, others are so overdrawn (Yuri, Tamara) that you just can't think of them as real people. The story does not develop and lead to something you did not expect. There is no flow. Ridiculous action scenes alternate with pathetic, kitschy good-bye talks that fail to catch you because NO actual human being would ever talk or act in the ways depicted here. There is no realism at all in virtually any scene of the film so how could you manage to connect to it?
But the worst of all is the awkward exaggeration in EVERYTHING shown on the screen. It is nice to see a nail-biting last-second escape in a movie. Seeing your main characters taking a one-in-a-million chance every ten minutes is revolting. It is an insult to your intelligence. In this respect "2012" has set a new standard. It makes all four "Indiana Jones" movies look like documentaries. Who cares for the laws of physics? Just invent new ones if it is necessary to save the hero!
Of course this is fiction and you are allowed some creativity to keep things going but there is a limit to what you can ask from the viewer to believe.
*** Spoiler*** My "favourite" scene of the movie: Our heroes are on a Russian cargo plane heading for China. The plane is piloted by one professional and a student pilot who has had a few hours on a single engine sports airplane(?). After having survived a last-second escape (see?) from the airport they are planning to get a refueling at Hawaii. Unfortunately the island has turned into a lump of molten lava and they have to continue their flight knowing they would not make it to China but go down somewhere in the open waters. The very moment they run out of fuel they discover that the Asian continent has moved 2500 kilometers in their direction(!) and they crash-land their aircraft on some elevated plain a stone's throw from the original destination! Of course there is a group of helicopters flying by only minutes later to pick them up and get them to the secret base they were heading for... *** End of Spoiler ***
And no, this is not an exception. There are numerous parts like this. It is just like I said: an insult to your intelligence.
Believe me, I could easily list at least a hundred of flaws and errors made in this movie ranging from human behavior over technical design to mathematical chances - not even regarding the constant violation of physical principles.
All in all I am convinced that it is for your own good not to spend your money on buying a ticket for this crap but find any other use for it. Burning it is a legitimate alternative. At least that would save your time.