It was not as good as the first but that is because i did not get the same exciting feeling when the robots transformered because it was so new and cool the first time and the action scenes weren't as good. It looked more cartoony and I dont know what the decepticons wanted.... A shard from the allspark? The Matrix? and the sun. Barricade did not show up when he left the highway scene in the first one and the twins disappeared and the thin robot that when looked at from an angle is invisible disappeared.
TO CLEAR THINGS UP:
the wanted the shard to bring megatron back
and
the matrix to activate the energon harvester. The energon harvester gets energon from the sun (I may be wrong about the energon-sun connection, but I think that's it)
In the final fight, Ravage (the "invisible at an angle" one you referred to) jumps onto Bumblebee's back and starts to rip him up. Bumblebee grabs Ravage and rips out his tail, pulling out his spine with it, killing him.
This group is for everyone that loved watching animated flicks made by Disney. Namely, those who loved all the movies released in the 90s like the Lion King or Aladdin. Pixar films included.