OK, I'll for once feed the troll.
What wasn't he great at exactly? Was he a bad writer for plots? Because you should look for "Two Gentlemen of Verona" in that case, a story about two sets of twins that get separated. It has a mixed up confusing and extremely funny story that also has a number of bawdy sex jokes thrown in. So: complex plot line with sex appeal for the masses. Right, I see why that wouldn't appeal to the masses.
Is it that his plays are unoriginal? Which ones? The histories? Because for that I totally agree, all he did was take someones life and duplicate it on stage! It's like he just studied history and then presented it for an audience! What did he think he was, one of the greatest playwrights of all time?
Is it his use of language that has you down? Because that one I honestly can understand. I had to take three different classes until it dawned on me that he was actually a genius that had the ability to compact story into paragraphs. Look at the opening scene of Hamlet. You have guards on the tower talking about Hamlet's father, the wars that he fought in, the foe he made in those wars, the history of Denmark really, all in that first scene with the ghost. It's all there, all the info you need for the back story is told in basically one paragraph. The problem is that that paragraph is REALLY REALLY hard to understand. It took us like 3 hours in class to break down that one paragraph, it was madness, but once we saw that it moved the scene so much faster and we understood the scene that much better, and that's the thing with Shakespeare: He does that all the time. Willie is great at making something both complex and simple at the same time.
There have been a lot of comments on here saying that you're wrong and I have to agree, he was actually that great. He's probably better than you think even. Give it another chance, give it another try, find a teacher that loves Shakespeare and ask them why he was so great, they can explain it and if you're willing to listen rather than just go "OK, well, but he's not that great. Whatever. Later" you could probably learn to appreciate his writing. It's tough, I'll admit that, but it's amazing stuff.