Sure, Smosh's humour isn't the wittiest. But it brings more originality to YouTube. Forget Fred or Phil. Phil is just another vlog (boring) and Fred just uses the squeaky voice to "try" and make his videos "funny" (awful) Smosh just puts the fun back into YouTube without bringing corporate mongers into the picture. They really make YouTube worth going to, especially when I see a new video from them. I always check YouTube every Friday (sometimes it takes 2 weeks for them to add a new video, though) but it's always worth the wait because I know I'll get a good laugh in after a hard day's work.
To the point, Smosh (along with Nigahiga) brings more originality to YouTube and that's why they're the greatest things on YouTube.
