Yeah no. I have builds that I have tried, and I find them disappointing. There are builds other people rave about, mostly involving TF or SS with Flask of Fire + Elemental mines and either stealth or Flanking Attack, but they don't work nearly as well as I'd like.
I've been experimenting with Parry builds, TF, etc. All lack sufficient consistent damage and control.
Poison is still terrible. There's nothing so far that can actually excel in Perilous that I've discovered (not that it doesn't exist, it just means I haven't discovered it). I've tried a lot of builds and seen what's out there so far. They suck.
Assassin does Single Target damage so much better, and poison / elemental mines do jack all for damage. Maybe in routine / threatening it is better relatively, but not perilous. Even flash of fire is pretty useless.
The most interesting part of the Alchemist is that Elemental mines benefit from dagger masterwork effects, and can trigger things like hidden blades when the appropriate off-hand is used. This is very RNG dependent though, and I doubt intended (i.e. they may take it out if BW decides to put resources into taking it out). Since it is extremely gear & chance dependent, I have a lot of difficulty reccommending Elemental mines except to experiment with.
Alchemist is not reliable at all. She's very volatile and chance based. Because of those reasons, I can't favorite her, as I need consistent results.