This used to be my bar. I still go every once and a while for nostalga, but other than that, I don't bother.
The food is fine. It's nothing super special, but for pub food it's fine. The fries and burgers are pretty satisfying and the hot wings are solid. Pretty standard pub fair.
The beer... well, its hit and miss. Sometimes it tastes like something funky died in the tap and sometimes it tastes flat. Occasionally it tastes like beer. I've tried most beers in there and this is a universal problem. They almost ruined Keiths for me, for which I may never forgive them.
The service is plain terrible. Now, I hate blaming the servers for this, because there just aren't enough of them. On weekends that place hops and they only have 2 or 3 servers. Sometimes you food or drink order will take an hour to come and most of that time is the poor server trying to shove her way through the crowd with five orders.
As for ambiance, well, the Kings Head is funky. It's got an old school wooden interior and look like its seen heavy use, which it has. What I'm not a fan of is some of the live music. They turn the volume up to 'ear bleeding' and let the dudes croone. Occasionally the live music is awesome, occasionally the guy forgets the words to the song he's singing and just goes, "duh duh duh duh duh REVOLUUUUTION, yeah, you know... duh duh duh duh duh duh." Buddy, if you don't know the Beatles, don't sing 'em. I've also been yealled at by the musician for talking during his set. I was unaware I was at the Orpheum. I had thought I was at a bar. When you play at the Kings Head, its ambiance, not a sacred act.
I used to love this place, but the negative things started taking over the positive ones. Now the terrible service and obnoxious music have chased me away. But fun times can be had their if you're patient and looking to get rowdy.