Aside from the name being obvious copyright infringement..

the original hotornot concept was about people posting pics to get feedback. here it's not clear whether the people submitted themselves to be rated, or can see the votes. it makes a difference whether users think their votes matter or not.

make sure the next feed you show me isn't the one i just voted on.

the skip button encourages people to not vote.

it's not obvious you can click the image to enter the chat room.

otherwise, it's pretty good :)