So, by my reckoning, The Witcher is only half an RPG. The role you play is non-negotiable - you're Geralt, a white-haired growly-voiced amnesiac anti-hero. Nor can you choose his profession. It is, after all, rather set in stone by the verb-slaughtering title of the game. He's a witcher, a professional slayer of the supernatural, wandering from town to town ridding the countryside of foul beasts using swords, magic and a little bit of alchemy. You'll be using the same swords for pretty much the whole game (though you can augment them), your armour options are limited and you've got a fairly rigid vengeance-fuelled goal in mind. If you're looking for one of those games where you can craft your own jewel-encrusted golden armour, and spend months tinkering with optional side-quests, then move along. This one isn't for you.
If, however, you're a fan of compellingly realised environments, commendably realistic social interactions and full-blooded fantasy storytelling then pull up a pew, since The Witcher has a lot to offer.