He has 11 starts out of 14 with 3er or fewer. If he was on the team to start the season and pitched like that they would have won most of his games. I wouldn't mind seeing him back next year. They need someone better than Tillman too though.
If he signs for something similar to what Guthrie got last year (3 years $25M), I'm all for bringing back Feldman. Maybe not a guaranteed third year though. As far as someone better than Tillman, Ervin Santana and Matt Garza would be the two I'd say are better than Tillman. Garza's probably the more affordable of the two.
EDIT: Add Ubaldo to that list, but durability is obviously a huge concern with him.