Even with patches I felt Rome 2 was a weak entry and it was a worrying sign for the direction of the series.
I'm more concerned with the overall direction of more and more DLC of what used to be included in the game, and just odd decisions made in Rome 2.
You've got a point that FotS was really good (although Shogun 2 is where I started to worry, Blood DLC, Faction DLC out the arse etc), and I heard good things about Attila, but haven't played it.
Either way, I am excited for Warhammer, but cautiously optimistic is probably the best way to describe it.