I can read this post two ways :lolGully State said:Isn't Just Cause 2 DX10 only? I think just having that should tell you that the devs took the PC port seriously..
1) You're being serious about DX10 support meaning they took the PC port seriously, in which case I'd dispute that since DX10 support was exclusive simply because it makes development easier. I don't really think it says much about their dedication one way or the other - just that they were willing to sacrifice some sales for a much simpler development cycle. In the end, it seemed to have paid off since people often remark how great the PC version is.
2) You're being sarcastic, and the same that I said above still applies - it's a sensible business decision to go DX10 only, since it's so much more straightforward to develop for it and ignore legacy DX9 baggage.