I gave it a go. Although I don't seem to be able to access beta anymore. But I ain't missing it tbh.
I have to say I was dissapointed. Apart from obvious lag issues, i just felt that the map felt alot like a load of set pieces linked together by concrete roads and bridges. It just didn't seem to have any depth. And as with this 'levolution' crap. I'd rather they spent more resources on the 'ground work' than on big show piece settings. I don't know whether it's the colour, drivers, video card or what, but I really don't think it looks any better than BF3. Not at the moment anyway.
I'm a BF fanboy, have been for years. But I got my fingers burnt with BF3 and won't be shelling out pre-release for this. Not as it stand atm. In fact, I think I'll be waiting a few months whilst all the release nonsense gets dealt with first. Then I might give it a go.