Honestly, I thought he wasn't bad at all. I thought Theo deserved that early yellow. The Coleman foul giving them a free kick was the only one I thought was bad - he swallowed the whistle, generally, in my opinion and let both sides play.
I had a look at RAWK the other day and surprise surprise, over there they're convinced that Atkinson gave Everton the advantage at every opportunity. Apart from his booking of Walcott early on and then failing to book Liverpool players for a couple very similar infractions, I didn't notice any egregious officiating outrages.