I liked Christopher Eccleston, and I was actually sad to see him go. David Tennant is in my opinion the greatest doctor (I welcome your hatemail.) and he is also quickly becoming a favorite actor of mine. Matt Smith on the other hand... no. Just no.
To me, seeing Rose go was depressing. Mainly the way they tore her away from the doctor. To have her story line now complete (with the end of season 4.) I no longer care to watch anymore, since I know she's off happy in some other dimension. Billie Piper is forever gone, David Tennant is gone... why watch the new series anymore?
I also enjoy watching classic who at times as well. Maybe I'll switch over to full time classic who since I refuse to watch Matt Smith.
I don't know. Maybe he'll grow on me someday, but I doubt it.