It depends on the game. I used maphack in Diablo 2 just because it was an already boring and necessary task to magic find, and this just made it easier.

In other games, not so much. I had blitz for gba and there were 2 or 3 plays that the cpu, no matter the difficulty, would always lead to an instant TD. I would have 200+ scores in 8 minute matches, which is just silly.

 Lol! i no what you Mean, i play Counter strike and on some servers i played on..alot of people "Rate Hack"

and its hard to Shoot them because there very Laggy and they skip around.. 

I rember a racing game.

We raced in 6 player races

I always finished 5th and on one track I was 2nd (Everyone was missing a bridge and going on to an earlier part of the track).

Then I crossed the grass at the finish line and dropped down to to 6th and ended up in 5th

hell yeah...espically on madden...i hate that with a passion....when i go to hike the ball...the game starts to glitch up when i throw and i miss the catch...the game goes to normal..im like WTF!!! and halo...im not gonna comment on Halo 2 on xbox live....whewww i will be all day on this thread!!

OMG!! i hate that sh*t to...especially in Gran Turismo 4....u hit the grass the cars come right close to u and u lose...that pisses me off..i turn the game off after that...

In multiplayer games I think this is especially problematic. When I play Tekken with someone we usually make some sort of agreement that certain moves won't be allowed. Jin's triple sweep, for instance, is forbidden for me to use. I think that when you play multiplayer you become the judges for what is right and wrong and the copperation elemt helps to harness in a game's imbalances and cheats. So for all the complaints about multiplayer...yes, it is definitely wrong. This is what bothers me about online play and why I will always prefer couch competitions vs the internet for multiplayer action.

In single player games I sometimes look at the gamemaker as my oponent. He/she has given me a puzzle or quest to beat and anything in that world is fair game. In my scenario the developer loses. I believe I broke his game in a way that either he didn't intend or didn't prevent. In my opinion, then, I broke this game and it didn't take much. That is failure in my book. In Metroid you can break the game, if you're good enough. I think the testers should have been trying a little harder to remove this exploitation. One simple fix, for instance, would have been to require the crystals to be gathered in sequence. While this wouldn't have eliminated the problem altogether, it would have lessened its usefulness.

Mario Kart for the DS

I can never win because People Use that Super boost move (idk what its called)

and they win in minutes

Snaking.

It's a technique that appears in virtually all racing games in one form or another.