I've never seen the old ones but my bf has one of the seasons (i think with Six?) on dvd. He lent me the new seasons 1, 2, and 3 over the summer and i watched them. I think Ten is marvelous, but i'm still not sure about Nine. He was a good enough actor, and a charismatic douchebag, but i cannot get used to his face at all, and the Nine/Rose thing makes him look like a pedofile. XD

Because i don't know how far through them you are, i won't spoil anything, but i will say that the Shakespeare episode was fairly grand, the end of Season 2 made me cry buckets for hours, and the Master is awesome and has wonderful taste in terrible music. ^_^