One of the attributes that need to adjusted almost across the board is enemy HP. I believe significant increase is required to make combat more enjoyable, and to allow all the players in a party to get at least some chance to get a hit in before the enemy goes down.

Elemental resistances and weaknesses should also be enhanced, so that more thought is brought into combating particular enemies. Maybe even to the point that an enemy with high affinity to a certain element only takes 1/4 damage from that element. Hitting a Coblyn with rocks should be less effective than melting it with a ball of fire.

I'm sure there are other enemy stat adjustment that should also be considered, but these were the top two in my head.