I wouldn't call them all hot, either. I was using the term jokingly.
Sushie, Sonic Adventure 2 Battle added Rogue!
Having clone moves is nothing new either. Usually, there's always some new characters that control almost like the old ones with a few differences. (Tails & Knuckles are no exception)
And characters aren't the true problem. The problem is that Sonic Team is having a bugger of a time making fun, fast 3D Sonics.