Yea there are guys like that.
Being a part of the Sonic fanbase myself since day 1 has shown me this.
But all I'm saying is that the entirety of the Sonic fanbase is NOT like that, Sonic Generations and Sonic Colors where 2 of the most well received amongst fans in a very long time.
Sure there are some who still had stuff to complain about, but it was a step in the right direction commercially and fanwise in my opinion.
In my opinion, yes, Colours and Generations were very well received, as they should be in fact. I'm not even saying the entire Sonic fanbase is full of raving lunatics or such, i am saying there it's comprised of several different generations of gamers who have come to enjoy the different kinds of Sonic games, i personally grew up with the Mega Drive games but i also accept the 3D games, i, like you, am perfectly happy with the direction things are taking.
Regardless though, when you've got people who enjoy the same franchise but came in at different times, they'll have different viewpoints and opinions regarding that series, especially for a franchise like Sonic that has changed so much.
Same thing can be said with alot of different franchises, Megaman, Mario, Zelda and so forth... it just tends to be a lot less extreme over in the other fan communities (Apart from that one point in time when Legends 3 got cancelled and everybody started frothing at the mouth)