As to the worry that the gang is "gross," too late; they are. In fact, there are few characters on television as gross as the main staples in It's Always Sunny in Philadelphia.
Yet, they are also incredibly funny as a bunch of losers who spend their lives in a bar that they own and run. Their hair brained schemes and weird ideas make them more than your typical oddballs. For instance, in "Frank's Pretty Woman," Dennis is really craving some crack. Who, besides an addict, normally does? Not many people. Lucky for him, he knows someone he can get it from - his (sort of) father's hooker girlfriend! This episode, like many, will have viewers almost constantly cracking up at the things the characters say and do.
The ending of "Frank's Pretty Woman" demonstrates perfectly what kind of people this gang is. Roxy dies of an overdose just as Frank is proposing. They drag her out in the hall, and plan to call 9-1-1 from a pay phone, anonymously. You know, if it's convenient. They certainly don't want to have to worry about answering questions and filling out paperwork. That would inconvenience their (planned?) fun evening, which will surely involve drinking at the bar they own. Never mind that a human life has ended, and one Frank presumably loves.
The gang doesn't concern themselves with anyone but themselves. They are TV's most narcissistic group since Seinfeld. They especially don't care about their customers, which is probably why there are almost never any in their bar. Just don't ask questions about how they manage to stay open and (barely) support themselves year after year. That would be too much analyzation for a series that doesn't need it.
Don't miss next week's episode, which finds the gang vacationing at the Jersey Shore. It will involve rum ham, a familiar face, and two very different parties.
It's Always Sunny in Philadelphia airs Thursday nights at 10 p.m. ET on FX.