One of the things I love most about gaming is the social nature of it. Being able to play with other people, either on LIVE or in person, is the most fun gaming time for me. Even with traditionally one player campaigns, a friend or two and I will sit around taking turns, playing until you die, spending 14 hours straight trying to finish a game. So something that is super frustrating IMO, are games that require lengthy one hour tutorials to even know how to play the game.
Lots of times, one or two of us will join in the game after somebody else had started. It will be a game we all want to play together. But it often requires each of us starting up a new save game and playing through the entire tutorial a few times to get a basic understanding of the controls. Or sometimes all of us have to start the game from the beginning, forcing the person who had already played to replay a chunk of the game.
It is a shame that games today are so complicated from a controls standpoint that people cannot just jump in and have fun without reading a large amount of instructions. It prevents people who have already played a game from being able to enjoy playing with people who have not played before. It really makes gaming as a whole a lot less social. The joy of gaming comes from the mastery of the game – learning how to build upon basic controls in more sophisticated and skill based ways.