I love this game. I'm about a little less than 1/2 way through Act III. I'm pretty sure I have completed all side missions because a trophy popped up saying so.
I have all techniques unlocked and everything upgraded.
I fear the end game is going to be a bit of a slog.
So, for all its praises, I'll list the things I don't like or wish were changed:
1. Travelling with NPCs, I spent about 7-10 minutes on horseback listening to the old woman drone on about how she hates her sister (in Japanese no less). I didn't care, I just wanted to get to the destination and fight somebody. If you won't allow me to skip this (I remember a game having a "skip to destination" button), at least put my horse on auto pilot so I can get a drink.
2. Cutscenes should be skippable. No excuse for that.
3. The game needs Gear sets/Transmogs, whatever you call it. If a mission works better as an archer, let me select my Archer build. If stealth, etc. In Act II, I happily changed the different sets. In Act III, I'm so OP, I don't want to futz around for 5 minutes trying to find the right charm through a list of about 50. I'll just wade into any situation with my Ghost build which defeats the purpose. Not sure how this didn't get past testing.
4. Not enough Techniques/abilities. I'm maxed out so there is little reason to beat a camp with the special objective or bother with a random encounter. They should have taken about 1/2 of the charms and made them techniques, like poison windchimes or hallucination 50% stronger, etc.
5. Craftable ammo. No big deal but it would be nice to be able to use the buttload of supplies I have no use for anymore. I waste time travelling to a Trapper before a mission.
6. I hate, HATE, the investigation missions which seem to be more active in the later game. I'm not a novice to these coming from ACreed games but 1/2 the time I don't know what the game wants me to do. I just run around in a circle until i get out of the investigate zone.
7. Small nit, the Traveller's suit rumbles when you are close to a collectible but I have no idea how to find it unless I stumble on it. There was another game that did this mechanic better, like it should stop rumbling if you aren't in the same direction, etc. Even better, let me see the outline of it in listen mode if I am wearing the suit. I just give up after awhile.