If I'm not mistaken, all the Barbarian gets for moving to Relic is +1 Rage, +1 Fury. If that was the intention, I don't play Barbarian anyway....no harm, no foul.
But compared to his or her 2020 counterparts -
Monks gain +2 damage, expanded stunning fist, and ranged FoB 1/rm.
Rangers - I assume the 4 CON > 3 CON > 4 Con will be fixed. But otherwise, the Ranger gets +6 Sharpshooter damage and can read a Druid scroll.
Paladins - Gain +1 to hit, +1 damage, another starburst for Evil Outsiders, +10 to a heal, and 1 use of Grace.
Suggestion - consider giving the Barbarian relic +8 to 2-H damage.
"IMHO we like to solve problems here on the forums that are only perceived problems due to a myopic view." -Bob C