I'm all for new characters within the G1 sphere - personally I'd like more of that rather than series reboots every 2 years (although I understand why Hasbro wants those reboots). I think the Mary Sue comments are what's most relevant here though. Sunstorm was generally well received despite being (essentially) a new G1 character, Drift is not because this character is "taking over the franchise" to a degree.

Had he been a story arc or someone in the general cast of characters (eg Emirate Xaaron), rather than being as prominent/powerful as Luke Skywalker, I don't think the animousity would exist.

Personally I'm glad we getting "new" G1 characters - just as I like Road Rage, Crosscut etc, and while Drift's toy isn't very G1 it's a great toy. I'm not a comic reader so he doesn't bother me at all, but I can see why others dislike him.