Well, I'm not fan of LF (on the contrary), but I can admit he is quite important, even since the first book. But even with all that he got those extra scenes like the one with prostitutes having sex while he talked about his past that was LONG.

And yes, I also have Anti-Theon biases, and I think Sandor is quite important. But he has been kinda... meh. (But has had, what, two lines?)