I think this is deceptively subjective. .NET was the first framework I had to be productive in (for classes, then for my job) and now I often feel deficient for not better-knowing the more traditional open source frameworks -- which is part of what makes me psyched about .NET going open source, I feel like now I'll actually be able to contribute to community projects. Up to now, I've always felt like I'm not a "real" developer because of my limited knowledge, but opening up the .NET means that my skill set will have some kind of value outside of my job.

This is probably key. There are definitely extremes on the spectrum, but I think the reality is that you'd have to have a severe perfectionism problem for it to have the same negative consequences as bad code written quickly.