What d'you guys think?

I've become a lot more aware of grammatical mistakes in people's writing, especially the writing of non-professional writers such as bloggers. I find that parallel construction is often not adhered to for instance. I don't necessarily know whether (NB: before the GMAT I probably would have written whether or not, but that's redundant!) following GMAT's grammar rules necessarily makes us better writers, but it's definitely something to think about.