Well, to be honest, if you are a rules-lite type of guy, then HMb probably isn't going to be much fun for you. I have the book and have read most of it so I can say without a doubt that even though it says "Basic" on the cover, don't be confused by thinking it is Basic in the sense of Basic D&D. This game is crunchy.
I should mention that I LOVE this game. It has now become my all-time favorite fantasy RPG - even over AD&D, and for me, that's saying a hell of a lot.
It is old-school gaming built with modern game design techniques - to quote a section from the introduction.
All I can say is that HMb is a hard and difficult climb to the top. It is truly something to brag about if you can claim you have a high level HackMaster character.
HMb isn't for everyone. It is hard hitting, old school gaming. If you don't like the realization that it is a deadly business to go traipsing around in monster filled dungeons and that your character can most assuredly die UNLESS YOU PLAY SMART, then HM might not be for you. If you like your characters to be powerful heroes right outta the gate, HM might not be for you. Victories are harder to obtain, but because of that, they are all the sweeter and more meaningful.
HM requires smart, creative play or you will constantly be rolling up new characters. It doesn't coddle to wuss players. There's no crying in HM.