Rattay had a 78 qb rating in 2004 with a 2-14 49ers team while the "great" Alex Smith had a 74 qb rating in 2006 with a 7-9 team.
Rattay is actually a good pocket passing QB. Go back to 2003 when Garcia was injured. Rattay did good. I personally would much rather have Rattay over Smith so if ARZ wants to make a trade, I'll be more than happy to do so.