My top platformers at the moment are Rayman and Giana Sisters: Twisted Dreams and LBP. Loved Klonoa too.
I'll always have a special place in my heart for Mario, but I think the 2d series has just got very stale. And I'm really worried about the direction of the 3D series.
Sonic games have always been a bit hit or miss, Generations was good though and the next game looks good too.