it would be more fun if i can join in some group in dark zones or missions online if there anyone at all in the game that isn't private mode but still fun, just more fun to play with people

Ye it's decent

This game is a ton of fun (especially with a friend (or friends))! It's quite amazing, I believe.
The gameplay is quite interesting like in any Tom Clancy game, for me specifically odd as well in some ways, but tactical and fun! There's a lot to do from exploring Manhattan/New York, all the random encounters, missions and events to the end game content which also holds a lot of value and offers a lot to do (different Mission Types for better gear, Survival mode etc.).
Graphics are stunning! Quite well made, beautiful and very realistic, in my opinion. I can't really believe this game is 9 years old. I don't feel like this is an old game (even though its almost a decade old :D)!
The storyline is interesting to follow, however its not something special that'll get you lore-searching. It's not something crazy, but its good.
Overall, I would personally give this game a 9/10!
-1 for the clunkiest controls possible (not key mapping, the controls over your character and what you can do overall, not only using them, if that makes sense), you need at least 10 hours to get used to them (of course, that may vary per player, but approximately 5 to 10 hours for sure) and even then it still feels a bit out of place and "wooden", if you will.
Other than that, this is a great game! I would definitely, even highly recommend getting and playing this, there's tons of hours of fun to be had in this (just be prepared for getting used to the controls)!