Yeah I have played one but it was crap lol, it was a long time ago when I first got homebrew though. Try doing a search on youtube or google to find one worth playing.
Also here is a list of games from the download section with the "Halo" keyword.
oh thanx, I found some really interesting ones on youtube that hav DL links in the discription...very interesting and cool but in no way could you play them as a real game...but still cool.
thanx