Theres lots of dark grey, and a lot of white space around the video's. You need to bring ALOT more colour in
Also its very generic in structure...
As for the domain...personally i dont like it..filmz.com is bad enough (I hate z's instead of s's) but filmsz.com doesnt really flow, and isn't even a word.
A better domain, a fresher design it could be good! Good luck