Why bash the IS-F? It doesn't make that car any worse or the M3 any better.
Lexus deserves credit for getting it right and making a great car the first time. It's a Lexus so the quality is excellent, the interior is excellent and the car reportedly performs very well.
I looked at the first IS-F that arrived at my local dealer and decided it didn't do anything for me styling wise. And I preferred the pedigree of the M3 and I'm glad I did.
Competition drives every company or they fall behind and fail. The IS-F will push BMW to continue to improve its cars and that's good for all of us.
2008 E92 M3 Silverstone II
2006 MB G500 Gelandewagen Irridium Silver
2006 MB SL500 Irridium Silver (wife's)