More advanced interface
Give us a nice interface allowing searching, sorting, etc. similar to what you can do with questions.
I'm not too fond of the black-box approach to doing things.
Imagine trying to answer questions in the same way - here's a question, can you answer it?
Leave the black-box approach behind or allow users to choose.
Users who don't review often may feel more comfortable with this proposed interface.
Allow your tags preferences
I know you can currently filter on 3 tags, but why not allow all your tags preferences to be in effect (and possibly allow this option to be turned on/off at the user's request)?
No matter which 3 tags I pick, there will always be a reasonably large portion of questions which I know nothing about, thus I must skip these questions unless it's completely clear what to vote. My ignored tags would mostly take care of this.
EDIT: Allowing all my tag preferences would probably allow me to pace through the questions (with accurate voting), where as now I'm digging through them. May motivate users to review more.