Michu, Swansea's favourite soccer Spaniard, somehow failed to make the top six for the main award, while rookie full-back Ben Davies was overlooked for Young Player of the Year.
Britton said: "We're a little bit surprised about the PFA awards.
"It would have been nice to see a couple of our lads recognised for what they've done. Michu especially because he's been fantastic and you wonder where we'd be without him.
"Ben was unknown at the start of the season and is now playing international football.
"We've got some tough games but we've shown we can play and don't have to fear these teams. I'm sure we can pick up the points to finish in the top half, which was our target.
"I hope we do, because we've been in there for such a long spell. I don't know if it's a League Cup hangover. It's not a case of us being drained or not getting up for games, it's more a case of going through a sticky patch and not getting points on the board as we were before.
"We're frustrated and want to put it right."