To be honest, I have actually written a pretty long review-ey type thing talking about the many things this game did right and whatnot but halfway along the way, it didn't seem persuasive enough to recommend people to play the game.
So instead, I'm just gonna list 30 awesome things/moments I can think of off the top of my head as to why you should get this game and play the heck out of it:
1. It has Transformers
2. It is amazing
3. It uses a lot of G1 influences meaning all the characters are their loveable and awesome selves, just as you remember them as a kid
4. The robots have all been redesigned with a modern look but still manages to capture the essence of the cartoons
5. Peter Cullen
6. The gameplay is awesome
7. The transformations are seemless
8. The shooting is incredibly satisfying
9. The voice acting is god damn great
10. Megatron is so gar, you can't help but follow him
11. Optimus Prime is as gar as Megatron
12. The world building and the atmosphere in this game is so effective that you do actually feel like you're in a war in a dying planet filled with robots
13. You fight a boss so big and so powerful that you have to enter himself, disable him from the inside, escape his inside before he crushes you as he transforms, plummet from space to the planet below WHILE fighting the boss and then watch him crash land like a comet into the ground...
14. AND THEN fight him again cuz he's such a badass and that crash land was apparently just a 't'is but a scratch' situation before you can finally take down this behemoth
15. Incredible boss fights not limited to the one above
16. Scenery Porn (especially if you like metal-themed environments)
17. Memorable Characters
18. Bumblebee is voiced by Lelouch vi Brittania
19. Multiplayer Co-op
20. Catchphrases, One-liners, War Banters and Transformer Jargon are all music to your ears as you play
21. Did I mention the voice acting is great?
22. The voice acting is friggin' great
23. You can fly
24. You can drive
25. You can shoot stuff
26. You can shoot stuff while flying
27. You can shoot stuff while driving
28. You can shoot stuff while flying, transform to a robot and proceed to shoot more stuff, transform into a jet and zoom past the baddies and into a sniping point, turn around, shoot stuff, transform and shoot stuff with your sniping weapon :D
29. You can shoot stuff while driving, ram into the enemies, shoot stuff while reversing, transform and shoot them in the face, run up to them and melee them in the face, transform and drive away :D
30. This game made me realise how incredibly bad the Bayformers were.