Should I bring a copy of an article I wrote in a science journal to my interview?
Yes you should.

I expect that a common question in any interview would be to ask the candidate about any piece of work of which the candidate feels particularly proud or pleased. Being able to refer to your publication -- and have a copy of it with you -- would be a positive thing. 

Regarding your opinion of the work -- you might be your own worst critic. Clearly the journal editor felt it was acceptable for publication. In a positive spin, you could outline in your interview where you feel the work could have been improved, showing a capacity for reflective practice.