I don't have any WMA files, and I don't think I've listened to any, in fact I dont know much about it at all, so I don't really have any oppinion.
But IIRC, MS hasn't opened WMA, have they?
And it does include support for DRM, no?
If either of those is true, then it sucks, no matter who develops it
Oh and I just use an encoder I found at vorbis.com, don't remember what it was called, was a while since I encoded a file(Im too lazy), but it works fine for me, not very fancy but that doesn't bother me.
Soon Nero will be releasing some public docs on how to write plugins as well, which will enable anyone who wants to to write a plugin to decode/burn ogg files on the fly, once that happens Im all set