Firstly, I played Hackmaster at GenConUK and really enjoyed it. It was fun, it was nostalgic (remembering how to calculate THAC0 again, argh!) and everybody died at the end.
BUT - I can't believe someone put up a post about how D&D3e is all about making money when I saw at GenConUK the Hackmaster Beasts Compendium - Book 8 or something. The number of supplements to that game seemed to me to be more than 'official' D&D3e products.
I think the basic game is very good, but I also think the joke has gone a little too far to seriously consider buying the thing. Ask yourself, do you really WANT to have a critical hits table that rolls a d1000? If yes, great. But think about it.
(But of course, getting your hands on a Hackmaster +12...that's a different story).