because there's so much change within cast, ideas etc that most people prefer one part of the show and potentially have other bits that they really dislike.

Very true! It's interesting to see how divided opinions are over Doctors; it seems like every Doctor has some passionate fans and some people who really dislike them.

then when the Tenth Doctor mopes like anything about her in later series, getting rather cross about it.

Having the Doctor mope about Rose after her departure was such a bad decision. I like Rose, but it's Doctor Who; companions are going to drop in and out, and setting one companion up as The Most Special Companion, The Doctor Is Inconsolable After Losing Her is doing a disservice to all the companions who follow her.

I liked his rendition of the Doctor, but didn't like the way the story was going as such and needlessly overcomplicating everything.

I have a similar attitude to Matt Smith's run. I thought Matt Smith was wonderful as the Doctor; he's actually more the Doctor in my head than Christopher Eccleston, even if Eccleston's run is my favourite overall. But I wasn't a fan of the showrunning in Smith's era, sadly.