Relentless (extra strike) weapons feel kind of broken, or at least way better compared to any other stat on a weapon. If you manage to get 2 of them on your dual wielding melee, the game is basically done. Also late game is sadly not as well balanced as early game, a well build party of lv15-18 should be enough for most of the encounters you can meet in the open world. There is not much you must come back later. I am at lv25 playing at warrior and did not feel the need to spend points for the last 5 or so levels.
Still, this is the most fun i had with an rpg in a long time. It feels completly different compared to other "modern" rpg's. The world is actually worth exploring and you remember parts of it, it doesnt feel generic. The map is not very big, but it feels like a world and not levels that are loosly chained together. I surprised to see how much they managed to cram into so little space. I mean 4(!) towns? Thats amazing.
I really hope there are devs that will take notes and build on this formula, this is how a turn based wrpg with open world should be done. And there is obviosly a market for this kind of games. MMXL was as silent no-advertisement launch of a game lauch as i have seen, and people still manage to notice and buy it.