I'm preaching to the converted I'm sure, but whatever you do, do not buy, play or even pirate the Transformers game. It's no worse on PC than any other platform, but it is quite astonishingly dreadful. Part of the reason for this I lay not at the feet of the developers (Travellers Tales, best-known for the diminishingly excellent Lego Star Wars series, but in fact with a history of horrific licensed titles behind them) but at the nature of the game.
Given its cast is, in the movie, demonstrated to be more or less invincible except at set-piece moments, the game has a hell of an albatross-o-con around its neck. It needs to devise something that sufficiently challenges the player without making them feel like they're not, in fact, a giant robot but are instead just another action game character with a health bar, who just happens to be 50 foot tall.
I'm not convinced that, at least whilst at the technological point the current generation of games hardware clings to, Travellers Tales has a lot of options on that front. Having to get Bumblebee to /exactly/ this spot within /exactly/ 30 seconds or the game ends is a horrible horrible horrible disappointment for anyone wanting big stompy robot kicks, but I understand why that was deemed a better choice than just making him as weak as John Q. ThirdPersonActionAdventure. There's a reason so many licensed games are as inspid as they are, and it's because of the restrictive nature of their brainless blockbuster source material and its immortal heroes. Incidentally, the reason the Transformers PS2 game a few years back did work well was because its approach was entirely different - no cities, no people, just one robot versus thousands. Without humans, there was no sense of being gigantic, so the brain happily settled into playing a standard but polished action-platform game.