Mind you I'm not that far in, and totally loves the game, but what I don't like so far is:
- Voice acting is inconsistent, and not too distinguish.
- Mute Big Boss, and anti-climatic meetings.
- Intro dragged on and should have been cut shorter.
- Open world is barren with almost no wild life.
- Need to complete side-ops to progress the story.
- Not as many cutscenes or story as in earlier games.
- Too much story is hidden away in the cassette tapes.
- Frustrating checkpoints, and you have to get the collectibles again after dying.
- Camera and control of D-Horse can be clunky.
- Slow load times when connected online.
I can list a bunch of cool and positive stuff as well, like the weather and day/night cycle, enemy AI, infiltration of camps, Mother Base management, graphics, OST, attention to detail, fulton system, controls etc.
MGS V has the best gameplay of the series, unfortunately I don't play Metal Gear primarily for the gameplay, rather I do for the story and cutscenes.
I'm gonna play some more tomorrow and have a whole lot of time next week. But it is these long games that I don't complete for sure, especially if I have to replay missions (but I take it, that it is a choice, yet is an advantage if you chose to replay missions).