Sherlock [BBC]

 Spoiler

I thought the ending was set up quite well to be able to be a series conclusion as well as having the cliff-hanger.

I personally thought season 2's first episode was the best episode. Really good showing of great acting, especially between Sherlock Holmes and Irene Adler.

But I want need to know: how?
I'm sure I'll get over it, but right now I'm not looking forward to the year-plus wait on the next season.

I also thought the first episodes were the best of their seasons, though more so in terms of plot and characters. Especially season 2's; Irene Adler just adds buckets of UST and fun to the whole thing.