I would say that tactician isn't exactly an enjoyable difficulty, really. There's definitely things I want to tweak.

This is speaking from a playthrough sitting towards the end of Arx right now, and it's gotten absurdly easy actually, with no fights posing a serious challenge.

The difficulty curve is really weird. The beginning and halfway through act 2 was absurdly, absurdly difficult and really, really fun, then it got quite easy and never stopped getting easier.

Secondly, once the fights in the early part got to stunlock, it was just tedious. Quite tedious. But the initial part was actually really fun and seemed really tactical. I think there's tweaks to it, though, that could be done.