Eyebeams, I take umbrage myself at your comment. Because a group doesn't have a lot of members who regularly buy gaming books, then the hobby isn't worth it? That's a seriously flawed character judgment. Feel free to speak for your own experience, but it doesn't apply to everyone here.
I stand by my comment. Obviously, not everybody is going to buy in with as much frequency, but that isn't the same as being to sole purchaser. It's:
1) Not fair to the person who buys the books.
2) Increases hassle at the table.
3) reduces the amount of variety.
4) Gives too much authority and responsibility to the person buying the books.
To wit: A group where one person buys all the books is not, in my view, a healthy gaming group. Heck, I'll go farther and say that groups where one person is constantly GMing is usually somewhat problematic as well.
I've had plenty of books that have disappointed me after buying them, but I don't fault the makers of the books. I do have access to ENWorld and RPGNet Reviews, to excerpts by the publishers, and word of mouth, as well as return policies to the stores I buy from. However, it doesn't change if a book IS a disappointment to me, and if a book disappoints a large segment of those who bought it, it just isn't plausible to chalk all of it up to simple failure to "Caveat Emptor."
That's not the entire issue, which also has to do with fans feeling that they are entitled to input in the creative process. They aren't. It has to do with sentimental feelings and the urge to collect skewing sales, which has ended up being a short term boon for some companies, but a long term burden for everyone. If a fan buys everything for a line or a brand, good or bad, it promotes products that further alienate the broad base of gamers.
I often ask folks to look at the comics industry to see what problems can/do come up in gaming. Comics appeased fans and satisfied collectibility to the nth degree, causing the comics industry to violently implode in the 1990s.
I'm certainly not saying reviews are worthless. I'm saying the fannish idea of playing at what a property is "really" about is categorically mistaken. The property is "really" about whatever is designed for it. If you think it sucks, the property in of itself should not be ammunition for further grief, and it shouldn't compel you to buy into it anyway.
Sometimes, there are books that are rushed, have production problems, or JUST PLAIN BAD premises. I can't think of many, but I do know it's too big a field for this not to be true.
Production problems are a different issue. If there's a misprint, that's not the same thing as whether or not the book appeals to your private fantasies about a game.
As for being rushed: 90% of game books fit that description. The fact that games are cheap, gamers are rare and few people make a lot of money at this compels publishers to churn out product at the very limit of their capacity.
I dowloaded the free-limited-time Player's Guide from DTRPG a while back. The SSS GW just did not capture the feel I came to expect from Gamma World, despite that I like Bruce, and I think he's a good author. It's a book and genre that was specifically made for that "aging segment" of gamer populace you criticized Erik Mona for serving, yet I don't feel it served the purpose it should have, instead trying to attract an audience that wouldn't have an interest in it.
I didn't criticize Erik Mona at all, except perhaps to say that I suspect that the sample of readers is skewed. The SSS GW was not, as far as I know, entirely designed for folks who remember the original (leaving aside my opinion that people's recollections of what Gamma World was like and about are so severely skewed as to be non-fact). In fact, the terms of the license made that flat out impossible. But as far as I know, nobody's written long laments about WotC forcing one of their own properties to divert from its origin.