MUSIC! You need to start adding music to the intros . Just keep reading tutorials, messing around in vegas teaching yourself things, and practicing. That's a good start but I would recommend either Adobe Premiere Pro or Final Cut Pro. If you don't have a mac then definitely Premiere.
Its pretty good for your first. Id try and be more adventurous though. Try putting a video in the background and sync it so it plays at a good time to fit with the text animation. Like i said its a good first effort if u need any help just ask ive done a few intros before which have been pretty good (so im told >_<. Good luck