@Anime:
…but Megatron KILLED Prime! He conquered Cybertron! (Well...both did.) And BW Megs, while killing Prime so that Megatron (G1) can win, wasn't the perfect guy. He had a rubber ducky and was once defeated BY A FART!
However, I will agree that BW (Season 2 especially) is the best TF series ever.
Original transformers Megatron always struck me as the equivalent of the man in your avatar. He's just the leader of the douche bag brigade.
BW Megatron, while having a silly side to him, was a robot with a grand scheme. He was planning to change history itself to further his plans, and manipulated an entire crew with false promises to do it. Whenever Rampage landed on the planet and everyone else was freaking out on what to do with this invincible beast, Megatron instantaneously thought of a plan to use him to his own advantage and carried it through, gaining arguably the most powerful transformer in the series.
Plus, his crew was just all-around more interesting and harder to control. While Original Megatron was surrounded by a bunch of boot lickers and incompetent weaklings (i.e. Starscream) that wanted to betray him, BW Megatron had to contend with a genius like Tarantulus and a monster like Rampage who would shred him to bits if he got the opportunity. But he plows ahead like always, and uses his traitors to his advantage. Like he states near the end of the series, "That spider's treachery has always been my best asset".
And oh yeah, I'd contend that after seeing 'Code of Hero' Dinobot could take any transformer from the original series.