All I can say is that most of my encounters with the police were pretty decent so far. Obviously haven´t met all of them since I am not online as a rebel that often, but I´ve mostly been treated nicely and every attempt of roleplay was taken and played along with by the police...
I´ve been asked to put my hands up or I would be tased and I simply started chatting nicely and told them I wouldn´t run or hurt anyone, I just wanna talk... Guess what happened? I sat down on the floor and the cop did the same while we were talking about the situation. Sometimes it depends on your own attitude, sometimes it might just be the wrong day and other times it might actually be a cop that can´t be bothered. That is normal, it´s human. Everyone has bad days and everyone sometimes gets annoyed with stories that repeat themselfes over and over again. For example, I am literally rolling my eyes every single time I hear "my leg hurts" when I am online as a medic. But that´s what it is....
Over all I think most rules on this server make sense, beneifit every faction and are also pretty nicely executed. You won´t be able to keep everyone perfectly in line at all times, but a lot of people are doing their best and poor rp situations don´t seem to happen that often in general, atleast not when I am around.
I hope you´re just gonna give it another try and see for yourself.
EDIT: About the video you posted... You were running away and also having a gun in your hands, even aiming it down the stairs at one point. Naturally the cops would try to secure you first before you could do any damage to them or anyone else around... If there was no proper rp happening afterwards, I understand your frustration, but just from what I can see in the video, I do not see anything that would not be justified to be honest. But that is just my personal opinion...