I think most people expect glitchy gameplay and whatnot in betas. What they don't expect is to not be able to navigate menus or even be able to play the game itself.
I would wager a guess that there are more people unable to play than there are those who can.
If you read their beta forums, it's been suggested that we're to just play in single player mode (just the map, no bots) and beta test from there. Ha. Whatever.
I consider a beta test a two way relationship. We test the game for free and in return we get to play a game for free.
The way they have it now is we can beta test the map for free but can't actually play the game. Fun.