I'm also not a big fan of the auto-leveled companions. Thankfully, I picked up four pretty early on so they're not too awful, and the party works fine on Hard difficulty. There are only two or three sub-optimal feat choices so far - Durance has some kind of "+willpower" feat which is a waste because he dies in about two hits (better than Aloth, who dies when a xaurip two maps away sneezes on him), and the chanter guy has Field Triage (which is actually ok, but considering how little health it heals, it's become pretty useless at the higher levels).
The ranger isn't that good in general, but I can already tell I'm going to be pissed off when I get the next batch of guys - we're all level 7 or so, which means it's a total crapshoot. Imagine picking up a guy with four different modal talents!