Alchemy in witcher 2 is so amazing because you have:
1-Combat potions: like fire and ice
2-Long buff potions: like strength and night vision
3-Instant use potions: like healing
4-Oils: that you apply to weapons for various effects like anti undead oils and such.
also, in witcher you can't drink 10+ potions in 1 sec you need time and preparation and you can't use them while you are being hacked by an axeman, also some potions have toxicity levels that will kill you should you drink too many buff potions, which means you can't have a HP reg. buff with stamina reg. buff and night vision AND extra strength...etc ALL at the same time
ALSO: witcher 2 has TRAPS, which are so amazing and cool because you have mob specific ones, like: anti harpy traps and mines and bear traps ...etc
I hope we see that in the next TES game
because you do know that the witcher 3 is gonna be the size of skyrim and an open world right!!
so I say Beth. are gonna have a big competitor pretty soon