Warwick's ultimate

Hello, I play Warwick alot and i have been pissed off from his ULTIMATE. Why every knock/stun (from the champ i am ulting) can stop my ult even while in the air just before 1st hit? I go 1/1 vs Xin and when he see me jump he just ult and stop my ult before 1st hit, once did it even after i 1st hit with R... I cant ult like half the champs, like xin - can stop my ult with his R and even Q before 1st hit while in air, Riven can stop it with stun before 1st hit while in air, Ramus can stop it also before 1st hit while in air, Tresh can hook me before 1st hit while in air and so on, and on. Also it's nearly impossible to jump from the side, allways a miss and i have 33ms, 200+fps. To ult someone i have to be very close even when i boost range with Ghost, because 90% its a miss... WW has nothing but R to attack from distance and when it's easy to stop or escape it (like xin's E and many more), it's impossible to even get to attack someone. If i can't use R even when 1vs1 whats the point playing ww? -_-