I don't think S5 was too bad. Didn't like "CaGG" or "TLP" too much, "TtR" and "BoE" were a little dry, but the others were great. My favorites were "AWF", "BtB" and "NoWW". It may be the weakest season so far in my book, however. But then it may grow on me more as time goes by, so I don't think it's fair to bash it too much yet. I'm also wondering (and hoping) on one more episode to officially end S5.
A little OT, but I just checked TAG's blog today, and the Foster's crew is off their hiatus and working hard (apparently on the second floor of the CN Studios building). As to whether they're finishing up season 6, preparing for a green light for season 7, or making some changes, I guess we'll find out sooner or later.