I watched your newest video as well as your Reading Habits Tag. Of those two, the reading habits tag was definitely better because it brought out your personalities a lot more on camera. I feel like the snog/marry/kill video would have worked better if it were shorter and if you expounded upon why you chose whether to snog, marry, or kill each individual in question. I don't know why it got dislikes.
For me, and I'm probably not in your target audience so take this as you will, I thought that overall your videos would benefit from more individualism. As you primarily do tag videos, you need something that sets you apart from other channels. Chances are you'll find this in your personalities, so don't be afraid to say what's on your mind or go into detail about things. A lot of the time, being totally open and looking like an idiot is far more entertaining to the viewers than being composed and closed off.