That's odd, whenever I flew to SFO I had a great time. The TSA agents were more than happy to give me free massages, which you don't see anywhere else.
The airport itself is pretty nice by the way, if you forget about going through security. I haven't travelled to any other US airports, but SFO is way better than some of the (mostly smaller) European airports I've been.
No traffic to the airport, in & out of security in 5 minutes (longest I've waited is 10 minutes), free wifi AND a TSA agent smiled at me. It's like another world.