Remember - I use Linux all day for a reason - it's the better tool for the job I do.
But - Linux is incredibly lacking in highly-polished commercial software. I miss the dozens of beautifully crafted packages on OS X, and their somewhat less crafted variants on Windows constantly. That final finish, and careful craftsmanship that occurs from making every button, every font, every round-rec flawless - is something that, for the most parts - is completely absent on Linux.
I am a contrarian when it comes to Microsoft and Linux - I genuinely believe that they are going to do the right thing (And I say this as a Former Netscape Employee who knows all to well their EEE pattern) - particularly if we get to use the full desktop experience in WSL - then we'll know they are really on the right path.
But - by and large, I'm guessing we agree way more than disagree on stuff.
However, I feel WSL means using Linux to enhance a product (Windows) while at the same time preventing the growth of that same system in its standalone fashion. Because WSL means you won't be using a lot of the usual Linux desktop stuff, you'll be a pure Windows user in a lot of statistical data, and you won't be helping to make Linux a better OS. Not to say that it can get worse once Microsoft starts releasing Windows-only Linux components for WSL, as (I think) started happening already.