Freeney isn't good enough against the run to be considered for the greatest DE ever, but when it comes to pure pass rush ability, I think it's crazy that he's pretty much on pace to wrap up a Derrick Thomas career by the end of next year, and way ahead of the pace of another HOF, John Randle. With 3 sacks in two games to kick off the year, I surely hope he can stay healthy and have that 15+ sack season that would re-establish him media-wise, while also giving him a realistic shot at the number-3 all-time sack spot.
On an additional note, the most underrated DE of all-time IMO opinion, Chris Doleman. Total monster that gets forgotten about.