THE EASIEST FIX TO THE GAME!
The problem right now is there are too many mediocre champs than the good ones
If the synergies are updated (say in line with the incursion buffs) then suddenly all these champions become assets and advantages.
Right now you have tame synergy strengths: +155 critical rating doesn't do much and all the old synergies need a rework
This way the game difficulty also will go down a few rungs. The content difficulty can be tweaked to perfection with these synergies
Overall the community will be very happy spending hours finding their best synergy pattern with any new champs they pull
Win-win for all I say!