I think -- maybe because I'm new to the show (mainlined the series in December and January so I'm at least caught up) -- that the season's okay. The only episode that made me facepalm was "The Thirteenth Step," and a couple of my favorites are present here ("Reflection of Desire" and "Coda"). I kinda like the Prentiss arc -- and Gubler directed the next episode, Prentiss's last, so, if Prentiss shuffles off the mortal coil, she's at least in good hands next week.

As for Seaver, well, I started off thinking the same thing you do, but she's starting to win me over. She's learning, and, while I'm not pleased they felt the need to bring in a pretty blonde girl who's essentially an intern, she's doing okay. She gets enough Captain Obvious moments to balance out the shiny and the angsty background -- plus, for the daughter of a serial killer, she seems remarkably well adjusted.

Also, I don't see the Reid/Seaver at all. He probably thinks she's pretty (she is), but I'm seeing nothing on her end, given their interactions are essentially:

Reid: *says something nerdybrilliant*
Seaver: *looks confused*

So, really, I'm not too worried.