At least for me some of the glitches make the game more enjoyable.
One is where when two cop cars are on the mini map at the same time one can go through buildings and under the ground. Sometimes resulting in a very large explosion.
I find that quite fun to try and do.
I usually will have one cop respond to something so I know which cop (one not responding) to hit.
Also it is more fun in Istanbul with the infinite mass mode.