Truthfully, I'm not always a fan of the 101 series. There's plenty of information that's hard to find on video games, but general info is not one of those things. Wikipedia is a tremendous source for a lot of general info, for instance (eg.
http://en.wikipedia.org/wiki/Survival_horror). My first thoughts for genres went to the two genres I'm most obsessive about, shoot 'em ups and rhythm games. Wikipedia covers them both.
I was excited to see the 3DO article pop up, because when I bought mine it was hard to find many resources on it. Then I read it and saw a lot of information that was easy to find elsewhere. That's NOT to knock the authors of said articles - they're well written and concise, but I think they play to the casual reader rather than the readers seeking out information.
What Wikipedia doesn't cover is opinionated subjects, such as best or obscure games. I've always thought that's where racketboy shines the most, as those are the articles I've gone back to the most. In fact, genre approaches could go a long way with comprehensive "best of" lists, as most professional websites or hobbyist websites tend to stick to top 10s. It gets especially hard to find such lists with older, more retro genres.
Regardless, if you want genre recommendations, I'd say stick to something retro. Platformers is a classic choice and a number of arcade genres have three decades worth of history to stand behind. That's where I'd start. I'm personally fond of shoot 'em ups and racketboy already has a few good shoot 'em up articles for specific systems. Wouldn't be a bad choice. It's also a subject I know a lot about (I have shooters on probably 25 different systems), if you need any references.
