Lack of Realism with regards to:

1. No pre-mission planning. Had to learn the maps blind, and a lot of the maps were huge in terms of surface area / number of rooms.

2. No trailers. The guys that follow the SWAT team and secure a room after it's cleared so suspects can't loop back. This would lead to suspects as well as hostages going into where you already cleared and was a massive pain in the ass. Hopefully they implemented these well.

3. Having to secure all evidence manually. It was super easy to miss something dropped - and let's be honest - that's not the job of the main element anyway - they're there to secure the area with regards to hostiles, not play bean counter with every single thing that could be classified as evidence.

Those three things seem to have all been addressed in some shape or form, though it remains to be seen how well its been done.

Game specific issues:

1. AI officers as well as suspects ranged from super human reaction times and accuracy to completely inept. None of this made sense.

2. No way to issue an "all clear" once all suspects were neutralized so any civilians in hiding came out.

3. If you played co-op with a friend, the game would not fill out the remainder of the spots with AI teammates. So if you've only got one friend, it's now 2 vs. 30 - good luck!

Unknown if any of these have been addressed. #3 probably hasn't changed.