Is Silicon Valley currently the best US sitcom?

I like Louis CK in theory - but it just depressed me so much, I had to stop watching after about 4 or 5 episodes. If I were younger, I'd probably enjoy it more; but since I'm probably around the same age, it's just too much of a downer, haha. I just started recently watching Always Sunny after a friend recommended it, and I'm on the 2nd season on Netflix. Thought it was an older show; I didn't realize it's still going. So far, though, I like Silicon Valley much better (although my friend assures me that Always Sunny gets better as it progresses). Haven't seen the others, will have to make a note to check them out.

Some write-ups on Silicon Valley, for those not convinced by my (or Graham Linehan's) raves about it: 

Yeah, the Peter Gregory character was hilarious, and the loss of Christopher Evan Welch is a big blow to the show, he was brilliant. (That Ted talk! Being carried out as some kind of Cesar at the "Peter Gregory Foundation's Fourth Annual Orgy of Caring"!...). I hope that out of a tribute to him, they cast someone who can continue to play Peter Gregory the way he played him.

My favorite episode was actually the first one. Chris Rock? WTF?! Haha. Just hilarious. But there were so many highlights throughout the season.

Unless Arrested Development gets brought back for a new season, I don't know of any American sitcom that can compete with Silicon Valley.

I agree with you there. One big problem I think is the female character, Monica, who is apparently going to play a bigger role in the future: she's just not funny. She's not even supposed to be funny. It's like, here's this great comedy, and then when she enters a scene (any scene), it's suddenly a soap opera. I expressed this to Mr Linehan, and he agreed, and wrote that it's worrying, but hopefully they'll correct it in the future.