I Can't be the only one who thinks that the police in GTA V, and GTA Online it's the worst ever existed on any game of this saga.. in that aspect, and being the game so realistic, the police could have been waaaaay better than it is.
To start, they are overpowered as f*ck, you can kill 300 of them, and they will keep coming, and keep coming all the time, so i have to guess that the LS police have more than 1 million officers, sometimes they can take even 10 bullets before they die. (god mode before it was cool).
To escape, you have to hide like for 5 minutes, it's just boring, you get into an alley and park your car, wait a lot of time, and just when u think the police it's going to leave, they suddenly know where u are, so they walk or drive into the alley and shoot you 'til you look like a colander.
and last but not least, the MOST sh*tTY THING OF THE COPS. You are in the middle of the dessert, no one watching you, not even NPC's around so you kill a guy whit a silcenced pistol, and guess what, the cops are on your ass in a second... ¿How do they knew u kill somebody? we'll never know.
Basically, the cops are one of the less developed things in this GTA.