Episodes I can't bear to watch:
1. The Girl Who Waited. Amy is not bitter and angry and I didn't like to see her portrayed that way.
2. Fear Her.
3. Night Terrors.
4. Daleks in Manhattan / Evolution of the Daleks
5. The Lazarus Experiment
I'm very ambivalent about "The Girl Who Waited." Bitter, angry Amy makes sense given the circumstances and it's quite a heartbreaking story. However, I'm very unhappy with the rushed ending and the fact that Rory doesn't seem more pissed off about the whole thing. If I were Rory, at the end of that episode, I would say to the Doctor, "That's it. We're done. No ifs, ands, or buts. We're done. Take us home, now!"
However, I totally agree about "Fear Her." I hate that episode. I haven't watched it in years. Whenever I rewatch Season 2, I always skip over this one (as well as "Love & Monsters"). I can't stand the faint, whispery voice that the posessed girl uses for most of the episode. I also think the episode exposes Rose's weakness as a character. Once the Doctor is taken out of the equation, the show loses its signature energy and Rose lacks the necessary screen presence to replace it. It's also a severe problem for most of "The Christmas Invasion" (up until the last 20 minutes when the Doctor wakes up).
I like "Night Terrors," even if it is a little schmaltzy. At least the schmaltzy-ness here feels fairly appropriate to the story (as opposed to "The Curse of the Black Spot," where it completely derails an otherwise decent alien-haunting-pirates story).
"Daleks in Manhattan"/"Evolution of the Daleks" is probably the weakest of the new series Dalek stories. But when I rewatched it recently, it wasn't nearly as bad as I remembered. And I'm quite fond of Tallulah (even if her New Yawk accent is a little dodgy).
I wouldn't single out "The Lazarus Experiment" for special dishonor but I think it is a very typical example of some of the worst elements of the RTD era. Particularly, centering much of the episode around running up & down corridors while being chased by a dodgy CGI monster. (SEE ALSO: "Tooth & Claw," "School Reunion," & "The Next Doctor." The Cyber-King is a little different but it's the same principle, just louder.)