Mafia 3 is very repetitive, after the first 2 or 3 missions you will have pretty much done all there is to do in the game. The storyline isn't much of anything really either.
Just started Yakuza and got to chapter 4 and I really wish it would give all the story dialogue a bit of a rest, some of them last 10-15 minutes a time. The story does seem quite interesting so far though and I believe it dies down from now on hopefully. Gameplay is much better than Mafia and there are already a lot of different fighting styles to understand and master, so I'm looking forward to getting on with playing it, which is in contrast to Mafia which felt like a chore and I only played it to completion as I don't like not too.