I bought this game out of curiosity. Basically, Crypt & Things is a variant of Swords & Wizardry that aims at running adventures in grim and gritty sword and sorcery settings. In fact, it provides such a setting, but I personally find it a little simplistic and bare-bone.
The main differences of rules C&T provides compared to S&W, is to get rid of clerics, and replace the usual generic magic-user by a mage that must either opt for White, Black, or Gray magic. The hindrance for playing a Gray mage seems ludicrous (it costs 2 hit-points per spell level to cast a spell, where White mages cast without hp cost), but it can be easily discarded. Same remark for black mages. C&T also provide a thief and a barbarian class, and the fighter can be customized.
Apart from this, I also appreciate the magical items that have some dark and detrimental aspects. The art and layout on the over hand, are often mediocre (though there is a couple of nice illustrations).
Overall this is a decent game. I give it three stars, as I find it neither bad nor great.
[3 of 5 Stars!]