I think that (in PPR at least), Celek is one of the most underrated players in fantasy right now. Would you believe that since Week 6, he is the #5 tight end in PPR formats? Yet, he continues to be ranked by most experts (FBG included) outside of the top 10 or 15 every week. In forward rankings, he's considered to be no more than a mid-range TE2. Even people that give him props, like in this week's waiver wire email, they only state that he is valuable for a week or two while Young is the QB. That's false though, as he was already producing before Vick went out. In fact, he was slightly MORE productive with Vick.
Here are his PPR numbers since week six...
Week 6 - 4/42/1 (14.2)
Week 7 - Bye
Week 8 - 7/94/1 (22.4)
Week 9 - 7/60/0 (13.0)
Week 10 - 4/53/0 (9.3)
Week 11 - 6/60/0 (12.0)
Week 12 - 5/75/0 (12.5)
Average of 13.90 points per game. Certainly not the type of scores that will win a game for you, but he is extremely consistent and is a great player for people who don't own the top 3-4 TE's. Personally, I was running with a Jermaine Gresham/Greg Olsen combo with mixed results, and I've been much happier going with Celek on a weekly basis.