Why is the glock so fucking shit

Well a glock can be very good at close ranges. To master the glock at medium ranges I suggest you practice the AK (one-tapping). It will really change your gameplay style. To be honest in long-ranges it is shit and only good for pistol and eco rounds (enemy-side). You are doomed against the usp at long range. So better not stay in the open or you will get destroyed.