I quite like G2 Sideswipe's colours, and G2 was the lowest point of my collecting. In fact, he was the only G2 Autobot Car that I bought. I skipped Jazz and Inferno. G2 Sideswipe is basically G1 Sideswipe's colours but in reverse. Oh, and the fact that he was a bad-bum commando in the comics also really helped. And from Hasbro's POV, they needed to do something different. After all, I'd only just purchased reissue Sideswipe in 1991 - releasing him only 2 years later in G2 with near G1 colours would definitely have made me skip him. As a kid with limited income, Hasbro would've had to work harder than that to make me buy that toy... turns out they did. Although it also helped that Sideswipe (as with all of G2) was a massive pegwarmed and I got him at discount.

I don't really have any favoured colours (can we have a poll option for this?), but as my toys are faction segregated, I notice that the goodies tend to have brighter colours and the baddies tend to be darker or more pastel. Not too many purple Autobots.