Not sure I understand your original question. Can you check the wording ?
Over the last couple of years we have been making a bigger investment in Linux support -- first with the new OpenGL driver in Sep 07, and with other improvements and open source support since then. If anyone is expecting all issues to be fixed in the next monthly driver release I have to say "sorry, not likely to happen" but you have to admit there has been a lot of progress over the last 12 months and if you extrapolate a bit I think you will end up quite happy with the results.
If, however, you are expecting an identical investment of resources into Windows (90% share) and Linux (0.8% share) client support, then I hate to say it but you are not likely to be happy with the results from any vendor.We are able to "beat the system" a bit by using common code across multiple OSes, but even that can only go so far.