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I haven't tried it in the latest expansion yet, but I tried playing as the Forest faction, and it gave me a bunch of units with fairy synergy, but almost no fairy summoners... So I decided to stop these experiments for now (although I ended up winning a decent number of games, but I just got lucky with the opponents, they were in an even worse state).
There are only about one and a half of these units with fairies, and most of them are in the cut version of the original game; you probably just messed things up because you weren't used to it. Besides, they added a lot of overpowered stuff to The Great Game.
Choose a deck for your opponent. Control over the situation is limited (you can only choose one of two options), but there is some mental load involved, albeit to a lesser extent than creating a good deck.
I have a completely opposite opinion. Drafting the best units in a regular tier 2 is just mindless; anyone who plays Arena regularly won't think for more than a second when making a choice, they already know all the best and worst units.
Drafting for the opponent was more difficult for me, considering that there are many normal cards, and personally, I don't often get two equally bad options or one super-awful one that would be suitable for an opponent in the corresponding mode. Usually, all my drafts look very good; the role is played only by who you get as an enemy and how the cards work out. I think we can thank the rotation for this again; Arena seems much more balanced since then.