How do shows like In Plain Sight, Burn Notice, Psych do so well on USA (all fun shows - me likey) yet on FX, Terriers doesn't get the love? I am guessing it's mostly an advertising problem, since USA ad spams their shows and the whole "characters welcome" is a nice overarching marketing theme.
Part of that is USA's success as a cable network. It has one of the largest audiences in all of basic cable. It also had a huge hit with Monk, which just recently ended it's run.
But remember, when Monk was starting to get hot, USA's parent company, ABC, tried to put it on IT'S schedule...where it bombed. ABC dropped it, USA kept it, and it ran for a decade.
And it (alongside a couple of other shows) brought viewers to USA in huge numbers, which the channel capitalized on by putting other well written and enjoyable shows on for those new viewers to see.
FX's biggest hits have- with the exception of Nip/Tuck- been "guy shows.". Not exactly a formula for failure, but like the aforementioned, the show just doesn't "fit."