Georginio Wijnaldum is a very talented player. PSG's forward is very strong. With Georginio Wijnaldum in the team, their midfield will become stronger. The PSG team will be more stable and strong next season. They have not won a title this season. They will definitely want to win the Ligue 1 title next season.
Wijnaldum is 30 years old, he is not going to get too many years left to provide if he is consistent or not, if he was so far according to your view then he is, if he hasn't been I doubt that in the next 5 years he is going to suddenly change that.
Talent is something else, consistency is something else, you can be a very talented player but then fall short and then even make a comeback, but consistency is something what you bring every game and play the way you play every game, doesn't need to be a superstar level, nobody expects that, for example Busquets was never a superstar, but he was a consistent player all his career, that is something Wijnaldum is in my opinion, he is not a superstar but he is definitely a player who is consistent on what he can do and thats what PSG is getting with him. Would have been great in premier league too.