Rivers is a pretty good quarterback.
He's started less games than his 2006 compatriots (128 GS vs. 142 for Manning and Roethlisberger), but he has a +15% QB rating vs. the league average. That's pretty damn good. Only a handful of QB's ever in the league can say that (10 total). Roethlisberger is at +12% and E. Manning at -2%.
Rivers playoff record is 4-5, but his TRUE PLAYOFF RECORD is 6-8. That's when you count each year you miss the playoffs as a loss and each year you are good enough to "skip" the wildcard round as another win. 6 effective playoff wins in 8 years as a starter is NOT bad.
That's equivalent to Drew Brees in his 12 years as a starter.
In fact, add 4 years to Rivers and you probably start getting very close to Drew Brees right now. Brees is +16% better at QB rating than his contemporaries. Brees is 110-75 as a starter (Rivers is 79-49). He's 6-5 in actual playoff record and 8-11 in true playoff record.
No reason Rivers can't be very similar to that in another 57 starts.
Roethlisberger is NOT that type of player or accumulator. His claim is more on efficiency stats and such a good playoff performer. Ben has a True Playoff Record of 13-8 in 10 years as a starter, which is very good (it should be better if we hadn't ****** around and missed the playoffs so many times under Tomlin). Roethlisberger is still very good against his contemporaries as well.
I think in the long run all three will make the Hall of Fame (Roethlisberger, Rivers and E. Manning). I would NOT vote for Eli, but I think he gets in because he's New York and he will be a compiler (play a lot time) and he has two Super Bowl rings/MVP's.
If you really consider the fact people like Fouts and Moon are in the Hall, you probably have to take all three of these guys.
I think the line that WON'T get in is the McNair, McNabb, Esiason, Bledsoe line.
If you are better than them, I think you have a pretty good shot.