I’ve been playing MMO’s since EQ launched in 1999, WoW in 2004, and FFXIV in 2013. In queued dungeon, trial, and raid instances, FFXIV players are overall more friendly, helpful, and likely to communicate. There is often a chain reaction where one person says something in chat and more people jump in. Players almost always exchange greetings at the start of the dungeon. I think WoW needs this system badly to improve the social experience.
In FFXIV queued instances, each player can give a single commendation to another player at the end of the instance after the last boss is dead. You cannot give your commendation to anyone you were grouped with when you queued. No friend abuse. You are not required to give out a commendation
There are rewards for reaching commendation levels. The rewards include mounts, pets, transmog, etc. Players want commendations so there is incentive to go the extra mile. This can include playing harder, helping new players, communication, describing boss mechanics, coordination, Joking, etc.
If you get several commendations, there is a great sense of personal satisfaction that you were the MVP. A great value to the team. Feels better than loot! If you get all the coms, you feel like a rock star flying high on top of the world!
Players rarely communicate or chat in WoW queued dungeons and raids. If we had this commendation system, the social experience would be much better.
If WoW added the commendation system with several great unique rewards for hitting certain levels, Mounts, pets, transmog, only obtainable from the commendation system. I think the overall social experience would drastically improve and make it feel more like an MMO in queued instances. I would like it added for dungeons and LFR.
If you think about what the system does overall, which is makes the game a more friendly, interactive social experience, people try harder, better communication and coordination, helping new players, conversations, etc. The little nit picking negatives don’t outweigh the many benefits.
Lastly, in FF14 there is a currency reward for instance completion if there is a new player in the group. The system tells you at the start. Everyone is happy to see a new player cause they get more rewards. They are also more more likely to help. I think adding some kind of new player bonus for dungeons in WoW would be nice as well, but that would just be gravy. I consider the commendation system top priority.
Disclosure: I think WoW is the better game overall. FFXIV falls short in the end game, zone activities and populations, and pvp.