Stickarena Hackpack.

Is Stickarena what I think it is? If so it sucks.

Depends on what you think it is. And it's good for when you have like 10 minutes and just want to kill some people really quick.

Tell me what this is please

Stick arena is a top-down online flash game where you play as a stick figure and run around killing other people with various weapons. From the look of the file, this is an edited version of the game System is distributing (or attempting to at any rate).