Firstly, there's a very strong chance you're gonna see Nash and Gaborik on separate lines very often, which spreads the talent around.
Secondly, the second line you're referring to as "not very good" contains our captain who just happens to be hard-working, hard-hitting, close-to-30 goal scorer. A kind of Dustin Brown player. Stepan is entering his 3rd year, aged 22, and has proven himself to be a smart 50pt center thus far. Without progress he's still a good 2nd C, and we expect him to continue his upward trend. Fill in the top 6 with one of Kreider/Hagelin who both showed impressive flashes last year, and are both extremely fast players...
Our top 6 needs to be in any discussion of "best top 6's around the league", and not anywhere near a "not very good".
Bottom 6 has some question marks and could be better, definitely. Especially the bottom 3 players. We have some young talent that should be able to fill that up sooner or later. Hrivik, Miller, etc. I'm hoping there's another pick-up at some point, another C hopefully.