I'm not saying he's not a winner.
I'm merely saying he may not have the track record to manage such a big club like Liverpool.
Granted, he did well with Swansea with limited resources. but that was over 2 season (which, by no means, considered a "track record")
Also remembered he didn't excatly do well with Watford and Reading.
And to now manager a club as big as Liverpool, is i think, asking too much of him. 

Rafa and Mourinho were different.
They were Champions League winner as well as domestic league winners with Valencia and Porto respectively.
Managing in the championship or even managing a very respectable 11th place in the EPL is one thing, guiding your team to win the domestic league and the Champions League is another completely different thing all together.

Yes. Every manager has to start from somewhere.
But that dosen't have to be with such a big club.
He could have gone to Aston Villa or some other mid table clubs and build reputation from there.
Managing at Liverpool is like throwing a small boy who just learnt how to swim into the wide open ocean.

Further with so many choices around, why Rodgers?
Why go for someone untested and unproven (2 sucessful season is hardly considered as a good track record more so that he did not win any throphies)?