6x6 is easier to punt a category in than 5x5 (since each category makes up 1/12 instead of 1/10 of the total). As people have mentioned punting/not punting will be argued as long as there is FBB. Just make sure if you do punt a category you're that much stronger in the other categories.
Personally, I have one league that I'm punting a large number of categories in this year. It's a 14 team keeper league where we keep 6. I didn't have a pick until the 8th round as I took over a pretty bad team and overhauled it to win in 2007. I was faced with the choice of trying to build a balanced team while not picking until the end of the 8th round or punting some categories.
I ended up having to punt saves, w's and k's (since there's no guarantee I could win ANY of them with what was left in the 8th round...which is really the equivalent of a 14th rounder when you take the keepers into account). I went with a MR strategy to complement my one keeper SP (Carpenter) and drafted Shields, Rincon, Linebrink, Duchsherer, Soriano and Rodney.
I also had to adjust my offensive goals as well...I had Pujols, Utley, Rollins, Rolen and Crawford as keepers. While I wasn't hurting in any area offensively my forte was R's/SB's/AVE while being average in HR/RBI. Since all of the big boppers left in the draft were long gone by the 8th round I'm semi-punting HR/RBI by drafting guys that are reliable in at least R/AVE if not all 3 categories but that I could get in the 12th round and beyond (Casey, DeJesus, Murton, Lofton, Sullivan, etc).
It's not a strategy that's going to win the league or even finish in the playoffs. There's not really ANY strategy that does that for you when you don't pick until the 8th round though. So there ARE times when punting makes sense...you just have to make sure you're punting for a good reason and not just because it was the plan going into the draft. For example, if some good SP had dropped to the 8th round (enough for me to have been confident I could build a decent SP staff) I would not have punted W's and K's. If some closers that didn't completely stink had dropped I wouldn't have punted SV's. If some big mashers had dropped to the 8th I wouldn't have semi-punted HR/RBI. It's all about going with the best value.