I don't know what the PS3/Xbox version is like but the Wii version is not very good at all. I have so far done 25% of the Decepticon campaign and it can be summed up with this;

Vehicle Mode: Drive/Fly, Shoot, Repeat
Robot Mode: Duck, Shoot, Repeat

You can not Transform at will, it is either Vehicle Mode or Robot Mode. I shouldn't be too picky. If I wanted an in depth gaming experience I wouldn't have a Wii, I would have a PS3/Xbox instead