Guys like Vinny Testaverde, Dave Krieg, Steve Deberg, Kerry Collins, and Carson Palmer have all been high on these lists as well. Meanwhile, guys like Steve Young and Kurt Warner haven't.
Longevity and rule changes (particularly the ones we started seeing in '03 and since) have been Eli's biggest friends. Throwing for 4,000 yards in a season ain't no thang in the current NFL. Players should be measured by how they stacked up against contemporaries and how they performed while they played.
As I said, he'll get in the HOF, but based 99% on his 2 titles. But the guy has maybe 1 time in his career (2 tops) ever been considered top 5 at his position in the league. Every other year, he's been a top-10ish type QB. Or in other words, he's largely been Vinny Testaverde, Dave Krieg, Steve Deberg, or Carson Palmer for the vast majority of his career.