Just got Powerglide, and damn, he is ugly. His only saving grace is the good size, and also the fact that his transformation has been one of the more satisfying ones to date. I like complex.
Whoever designed the oversized engines (that ruin most of the otherwise good looks) and the landing gear should be shot. Oh yeah, and also the gun.
Prowl is quite cool. I like how everything is hidden in vehicle mode.