I would love a closed beta! My friend and i where talking about this the other day... He believes that an FPS would need a beta of some form or another, where as i was saying that i don't think it's need cause an alpha and family tasting can do the job. I still want one tho! Just to help with the working the kinks.
I do like the idea of the Closed beta for several reasons.
1) The more people who test it the more glitches and issues they will be able to resolve before release making it less effort to patch later. On top of that OTHER people outside the company tend to see and pick up problems better than the developers themselves. (It's like essays at uni, you make mistakes but other people are the ones who notice them.)
2) For those who have pre-ordered the game already have a long wait till the game is released so it'd be good if they could have a taste of the game a little
3) It will increase the chance of sales for Bethesda because people will most likely post good statements on it, it will become more known and more gamers will become interested in it.
4) Well who doesn't love betas xD