I really struggled with this. IMO the UI is too big vertically. Playing in a top lane I just felt really, really claustrophobic or something. It really unsettled me not being able to see more than 2 inches ahead of myself, and I spent half the game clicking on the UI. There wasn't any issue playing the second half of top, mid was fine, and obviously the first half of bot was too. Basically any vertical plane just felt really cramped.
This could just be me, but the autoattack kicking in when you were retreating really got on my nerves. I'd run back (maybe because of the screen height issue) and at the end of the pathing, my champ would often run back towards the creep line to autoattack one of them. Basically I either spammed the right click, or I'd end up dying.
Apart from those 2 things, I thought it was ok. I don't really think it's going to be my cup of tea, but it's certainly solid enough in it's current state.
I get the same feeling sometimes during games like SC2. They keep the shown area the same for everyone due to "Balancing" reasons.

if it really was done mutually im pretty happy, two favourite developers/publishers.
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Lol. I have uninstalled steam and even went as far as removing some friends who might remind me of dota. Still after a few days I fancy playing. Lol 