I think serialized programming is a bit overrated, even though admittedly, it's the way to go in this era. On this board, it's like if the show isn't serialized, than it's inferior and that's not true. It's just different. Just because a show like CSI, or TNG, or Star Trek, or any other procedural, it doesn't mean it's bad because it's not arc driven. Also, my major problem with Arcs is really the pacing. You can have so much build up, and a good beginning and middle, but the ending is typically pretty weak. Hell, a show I like, Babylon 5, did this with the Shadow War. It builds and builds, and then when it comes to a conclusion, you're like "That's it." Of course they ended the season awesomely with the retaking of Earth arc, but my point is if you build and build, and then you get a less than steller ending, I start wondering if it's all worth it.
I like shows that can have middle ground. Babylon 5 somewhat did this, even though it was purely arc driven, but the best examples were Farscape and DS9. Also, I really hate the concept of "Filler" episodes. An episode is either good or not. 24 is the first show to come to mind with this problem. This season has been disappointing, the one of the more common comments is just be patient, the good stuff is coming. Well that's all well and good, but you've just wasted 2 or 3 valuable episodes. If you're not going to advance the arc, fine, but make the episode interesting by having an internal story or great character work. Like I said, an episode is either good or bad, never filler.