It would be interesting to put Devils against the other Pot 4 teams from the CHL and that would perhaps give a decent reflection. DEL, Austrian, Swiss, Lliga, SHL and Czech teams are all obviously higher but as concerns Norway, Denmark, Poland, Slovakia etc I'd think Devils and top EIHL teams are probably top of the also rans.
I'd wager the EIHL is now above the ECHL with the top teams sitting around AHL mediocrity.
Where the EIHL is doing something right is professional standards. They are finally conducting themselves as a serious entity and the bush league reputation is dwindling. The CHL inclusion and better relations and shop window with European hockey being massive instead of pretending they were a North American farm league and doing everything in poorly executed NA way.