Only one word can describe this game, FANTASTIC!!! This is a must-have for any Transformer fan. And even if you're not a fan or not interested in the lore, the gameplay will definitely keep you interested. As like any Transformer game, you have to make good use of both robot and vehicle forms while using a vast array of weapons to achieve your goal in both the singleplayer campaign and the multiplayer or escalation modes.
Best thing about Fall of Cybertron is definitely the story itself. Fans would recongize many easter eggs from the entire franchise here and there in the game. Voice-acting is top-notch, you can't doubt Peter Cullen as Optimus Prime. As for the other voices, they are quite close to the original cartoon series in the 80s although I admit I don't like Shockwave's voice. The plot itself is really good but it is way too short. A playthrough on Normal would probably take 10 hours average, maybe even shorter if you're not the exploring type.
Other than that, well, you get to play as Grimlock for one mission and a half (best part of the singleplayer campaign). Nothing beats being a massive, fire-breathing T-Rex with plenty of rage. Fan or not, buy it. You'll enjoy it.