Hilarious
First, if you hate this game because you can't figure out how to make the punches work, you're a moron. Seriously, drag, then click the mouse. You don't even have to do it quickly.
Second, the art and arcade feel of the game is hilarious, especially with the different events that happen (Britney stepping in, the cheesy announcement of a new challenger, Metal Slug intro, etc, etc). I love the little damage counters that popped up too.
And for some reason, the screech when you click the right side bar to start the fighting is really funny to me.
Oh, and Brit's scream when she drops the baby is hilarious.
Admittedly, the punches do have slight glitches. For example, if you hold the power shot for too long, that fist gets stuck sometimes until KFed punches you. Also, after powering up and doing some fast clicking/swinging, I could get in some double powershots, but that's a sweet glitch. In any case, a little practice and you can really overlook it.
It's not the best game ever made on Newgrounds, and it's not the funniest, but put together, it's better than 95% of the stuff on this site.