If one is looking for a reputation system. Gamification really doesn’t imho provide that
There is an old plugin called User Feedback iirc but it is broken and only provides scoring out of 5 with optional user feedback comments.
This would need updating/fixed
Using Reactions you could likely create something custom if you use a simple idea of and maybe with some kind of data explorer query with something custom to update a count? Maybe a custom automation with a TC?.
Or perhaps Post Voting with some custom CSS? But need a custom query TC to add talkies to the user Post/comments or usercard
and 
maybe with some kind of data explorer query with something custom to update a count? Maybe a custom automation with a TC?.