Laurel had a bad storyline on season 2, a storyline that wasn't even that bad, but it seemed much worse because at the same time there was Sara basicaly being the female Arrow. Season one Laurel was fine and this season she's much better and on the path that ppl wanted her to be from the get go.
Just give it time and ppl will come around. Ever since the last 3 episodes of season 2 you see ppl warming up to her, with the "I didn't completly hate her" or "she wasn't so anoying" to the "she was kind of good this episode". That is very diferent from the "she's stupid", "I hate her", "kill her character" that she was getting through the first half of season two.
Now that the romantic drama that ppl didn't like has been transfered to Felicity who is a fan favourite so they can write those storylines and ppl will pay attention and Laurel is getting towards the kick ass character (and we know from Supernatural that, altough Ruby is very very diferent personality wise from Black Canary, Katie Kassidy was really well received in that role), the hate will eventualy disapear or be very very small.