This is exactly how I feel. Anyways..
Pros
-Single player is amazing, story and gameplay wise.
-Hacker culture is always a bonus. Basically it's GTA V for nerds and you're the good guy.
-Lots to keep you occupied. Mini games, side missions, etc.
Cons
-Multiplayer isn't anything i'll remember as being worthwhile; especially tailing someone and it spawns you right in their view half of the time. When in multiplayer racing my frames per second drops like crazy and people race dirty as hell. Not to mention every time you're at a intersection three cars instantly pull out in front of you if you're in first place. (Happened to me NUMEROUS times while I was trying to get the racing achievement for 10 games played.)
-Some of the animations like taking down a cop instead of killing them (you lose rep when you kill them, I don't want to know what it's like having red rep.) or falling and then getting up take too long and if you're in the middle of a fire fight that's a instant game over. I'm not saying Aiden is a superhero but at the same time it's a video game. Not a realistic modern day hacker simulator.
-Doesn't have an option to have weapons removed from the quick select dial while playing. Can be very annoying when you're in the middle of a firefight and you're trying to swap from your awesome grenade launcher to the top tier sniper rifle and you have to go through several weapons to get to it.
Definite 8 out of 10 in my book and I plan on completing it 100% regardless of having to grind out multiplayer achievements.