Sorry but companies like Abit (RIP) and Tyan have a better record when it comes to items like that (in fact Gigabyte does a lot of that as well). Asus doesn't stand out at all in those reguards.
I had complaints about my 5 year old Asus M2N-E (Socket AM2) BIOS not officially supporting AM3+ CPUs. After showing proof that I (and many other people) had these brand new AM3+ CPUs running in 5-year-old AM2 motherboards as an "Unknown CPU", ASUS eventually released a BIOS update that supported these CPUs.. The overwhelming majority of other mobo manufs. never released a BIOS to support an AM3+ CPUs in an AM2 socket. In order for Asus to make the AM3+ CPUs work in the AM2 Socket motherboard they had to delete a few features from the BIOS to make room for the AM3+ CPU microcode. ASUS did provide what their customers were asking for, even if it meant axing their own "features" to cram it in there. So I think that was pretty darn cool.. No other Mobo manufs. would go that far in order to cram additional microcode into their BIOS just because their customers wanted it..
Might want to search the forums, have posted transcripts of Asus's uselessness from past BIOS bugs.
So yea, I don't agree that Asus BIOS engineers won't listen to anyone.. They most definitely do listen... How many people have gone to Asus and asked about this ASPM problem? I'd bet no more than one or two, if any.. Heck, nobody even knew the cause of the power management problems until Phoronix pointed it out..