Odhanan
Adventurer
It depends indeed on how much the players know and care.
I believe, however, that no GM can have an understanding of a given game if he hasn't read its core rules and background and worked out how these two elements mesh together. Way too many GMs assume they know a game just by reading its background or assuming things with just a scanning of the core books. For instance, many D&D DMs out there just assume they know Third Edition D&D, both in rules and feel, from having played AD&D. It's a bit like thinking you know what's in the DMG 3.X because you've read the AD&D 1E's DMG. That's a gross mistake (and believe me, I know many such DMs).
Further, no GM in my opinion can fully understand what s/he's doing when houseruling a game s/he hasn't fully read and understood. Many such examples of bad houseruling exist in my opinion, starting by GMs reading a particular rule, not liking it from the get-go and modifying it right away without thinking of the "domino effect" it has on the rest of the game. This is especially true of the d20 System.
So, yes, I believe that to be a decent GM and run a particular game, you should at least have read its rules and understand them, if only to know what you're doing when you're discarding some of its components.
I believe, however, that no GM can have an understanding of a given game if he hasn't read its core rules and background and worked out how these two elements mesh together. Way too many GMs assume they know a game just by reading its background or assuming things with just a scanning of the core books. For instance, many D&D DMs out there just assume they know Third Edition D&D, both in rules and feel, from having played AD&D. It's a bit like thinking you know what's in the DMG 3.X because you've read the AD&D 1E's DMG. That's a gross mistake (and believe me, I know many such DMs).
Further, no GM in my opinion can fully understand what s/he's doing when houseruling a game s/he hasn't fully read and understood. Many such examples of bad houseruling exist in my opinion, starting by GMs reading a particular rule, not liking it from the get-go and modifying it right away without thinking of the "domino effect" it has on the rest of the game. This is especially true of the d20 System.
So, yes, I believe that to be a decent GM and run a particular game, you should at least have read its rules and understand them, if only to know what you're doing when you're discarding some of its components.
Nothing against programmers...I admire their ability to create. They just don't have an eye for layout. Programmers would be perfectly fine having a program look like it was made in 1990