In terms of bugs, there are a couple that really drive me batty. The XML parsing error is the worst, but the fixture rescheduling was pretty bad, too.
In terms of gameplay, the match engine clearly has some problems, and they seem to have become worse since 8.0.1. But there are other aspects of the game that I like very much, and overall I think it's a better game than 7.0.2.
This is the first version in which I've used the 1 week trial so extensively. For some reason, scouts respond with fewer attributes than they used to, so with unsigned players, the only way to see all their attributes before signing them is to get them in for a trial. My pre-season training session looked like I was holding open tryouts!
As for getting wound up, don't worry about it. I find this version to be the most addictive in years simply because I can't rest without solving the tactical problems.