Wait, before you buy! I DISAGREE!
Every time these games go on sale, this thread appears! I eventually bought Oath in Felghana based on these threads.
Oath sucks. It's a clunky, grindy, samey, shallow game.
The controls are bizarre (apparently it was originally a PSP game, and they couldn't figure out how to make sane controls for the character)
The hit boxes, level design, and boss design are terrible. (These have some of the worst bosses I've ever seen in a ARPG. Who thinks the bosses in the Lava Caverns are fun?)
It's grindy: Good luck beating some of those bosses or areas without running around in circles grinding for EXP. Damage is non-linear in this game, so there's an effective threshold level you need to be able to beat a boss without spending 30+ minutes whittling it's HP down to zero while avoiding the same 2-3 attacks.
It's samey. It follows the ARPG design of: A bunch of repeating rooms randomly strung together with the same 2-3 enemies in them. The levels could almost be replaced by a random level generator.
Shallow. As far as ARPGs go, this is one of the most shallow game's I've every played. Fighting simply consists of mashing attack, or using one of three specials. The main character has a few other basic attacks, but not many and poor controls makes some of them borderline useless. The main focus is on leveling up and stats.
It's a boring, tedious, game.