turrets are stationary and were nerfed to oblivion because people kept complaining about them
personally I'd rather have steam creatures then golems
there's already an alchemy traitline for engineer and imo plaguedoctor sounds more like a necro elite
i know ai classes have flaws, ive played tons of them. i also know how funny it is when a "bad ai class" is top/close to top dps in pvp and raids in other games when its decent enough.