On this website there are a lot of people who are good at algebra and things like that and I see only 3 or 4 people answering analysis questions. I'm referring mainly to PDE and functional analysis. This is a problem in Mathoverflow as well. Why is that??? I think analysis departments are in general the biggest in most math departments.
My feeling is that Math.SE is doing okay in the applied, variational, functional, and harmonic branches of analysis, and doing quite well in the classical real/complex areas. Yes, it could use more people working in nonlinear PDE / geometric analysis. Then again, there aren't that many questions here that would be of real interest to them.
I like this answer given by one of the most active analysts on MathOverflow (source).