You get to see optimus as a complete bamf in this one unlike the last. Its funnier than the original. There's more megan fox provocativity. You even see bumblebee get down in this one. Whoever says there was no plot obviously can't pay attention, but there is a ton of action, ill give it that. I think the story of the origins of their race holds up very well to the intense action sequences.
The only bad thing I can say is that around the middle, the action sequences can get a bit lengthy but I'll tell you what, that was the quickest 2.5hr movie I've seen in a long time. Best movie since Iron Man!