One of my favourite moments in G2 was when Megatron and Prime were forced to team up against Matrix-powered Starscream. Megatron questioned himself as to why the hell he always lets Starscream back when he's proven himself time and time again to be a self-serving traitor, and Megatron's answer to himself was something like, "Because I'm an idiot, that's why!"
Other things I liked:
+ G.I. Joe's intergalactic beacon which allowed them to summon the Autobots back to Earth when the Decepticons attacked.
+ War World!!!
+ Dr. Biggles-Jones, she's smart and she's hawt!
+ Jhiaxus; very cool villain =D
+ War World!!! (just deserves a 2nd mention)
+ The freakin' SWARM! (who would go on to influence the Beast Wars in a major way)
+ Sideswipe - his G2 repaint didn't suck (sorry iceburn, I'm just not a big fan of blue Grimlock) and they made him a bada$$ Rambo-esque commando!
+ The Liege Maximo! Okay, he didn't really do much other than just sit there looking really menacing and bad - but that was cool. And subsequent Beast Wars canon has further illustrated that he _was_ actually as bad as he looked, having torn the Matrix from Primon with his bare hands! Nassssty.
+ And did I mention War World?![]()