-Lobbies give you 1 minute to fill them or youre stuck with however many players actually enter the game without losing their connection. On the rare occasion the game does decide to fill your lobby, it will do so at a very slow rate just before or after the time runs out for people to join causing you to wait up to 5 minutes for the job to start.
-screen effects during kill streaks that make it more difficult to see and continue said streaks.
-almost no use for a stat called stealth. No hardcore blipless freemode, even though many players including myself have asked for this since day 1 of online. Radar in deathmatches instantly gives away the position of all players in sight regardless of cover or distance.
-features and games from previous rockstar titles left out that would add to the fun I.E. land grab, gang wars, cops n crooks, gold rush, etc. Not to mention the exclusion of the posse system in rdr which was an ingenious way to identify players in free roam.
pressing triangle gives you 30 more seconds and is virtually worthless, but if you change the matchmaking mode from open to closed and back to open and then redo another auto invite it will reset the timer and you can do this as many times as you want, or if everyone you want to join is on your friendlist just set it to closed and invite them and there is no timer. Most randoms wont stick around long if no one else shows up after you do this once or twice though.