As long as the rules, exceptions or house rules are explained ahead of time, I have no problem with that. Not EVERYTHING can be explained ahead of time, but I've found that most things can be covered under general principles.
One of my house rules is, "If it's broken, don't bring it into my game. If you do, I will remove it. I am the final arbiter of what is broken."
For the most part, my house rules are laid out and explained ahead of time. In D&D 3.5, I use core only for players, and various monster books that they don't know about. In d20 Modern, the core rules are used, and then certain books like Charles Rice's Blood & Guts 2, and Blood and Fists: Master Edition (with a few exceptions) are open.
One of my house rules is, "If it's broken, don't bring it into my game. If you do, I will remove it. I am the final arbiter of what is broken."
For the most part, my house rules are laid out and explained ahead of time. In D&D 3.5, I use core only for players, and various monster books that they don't know about. In d20 Modern, the core rules are used, and then certain books like Charles Rice's Blood & Guts 2, and Blood and Fists: Master Edition (with a few exceptions) are open.