PhysicsOverflow is meant to be a rather professional (knowledgeable enough enthusiasts are welcome too IMHO) higher-level physics site, where graduate-level upward physics and related maths questions can be asked and answered in the Q&A section, and research-papers can be refereed and discussed in the Reviews section.
Concerning the Q&A section, it is rather clear what this means, and the level of questions can be maintained by means of community moderation.
For the Reviews section, the case is less clear cut. An important question that we probably should discuss again, is how much and what kind of non-mainstream physics we want to allow there. See for example here, and here for earlier discussions.
Related to the issue of non-mainstream (by the real world community of physicists not accepted) physics is the question of legitimate sources for submissions in the Reviews section. Is it really a good idea to (generally and unfiltered) include Vixra?
More generally, what standard or lower-level cutoff do we want to apply to the reviews section?
I personally think that we should by all means avoid that PhysicsOverflow looks like an unmoderated forum where cranks and crackpots can freely propagate and use the site as a platform to promote their personal non-mainstream theories and attack legitimate physics at the same time. Otherwise it might happen that good people already on PhysicsOverflow are driven away, and new nice knowledgeable people we would like to see here are prevented from joining.
To be honest, the fact that the "lively" but not really constructive, not really enlightening and at times even very off-topic discussions about non-mainstream physics, driven by always the same people, that pushed discussions about mainstream physics away the last few days, make me feel very uneasy, because I personally think that this is not what PhysicsOverflow is intended to and it makes the site look not so good.
How do other people think about this?