I'll take the pragmatic approach. XP is meaningless -- I could pick out people with much less XP who are both better programmers than I and are better at Perl. Contrariwise, I could point out some higher level monks who still don't seem to get it. Don't even ask for the latter.

• Efficacy -- does your code do the job? Is it sufficiently efficient and effective?
• Extensibility -- when requirements change, how much work is it to add new features?
• Maintainability -- to what degree can you or someone else fix bugs and keep the code running smoothly?

Fill in your own definitions for all of the adverbs. When you're satisfied with your progress on this front, you'll be well on your way.

A side note -- very few good programmers are worried about hurting feelings in code reviews, for good or evil. At the risk of prematurely associating myself with that elite group, I'll just say I want software that doesn't suck. I'll try to be nice about it, but I'm not going to mince words if you have a security hole or are (ab)using a feature too much. Now if you repeatedly demonstrate that you don't get it, you will get it. :)

Update: Higher level than *most* people, not me. Those four most definitely get it.