J., i am a mom of 3 kids, and they do own the wii, and they have played guitar hero, i did not buy these systems, however my oldest son, is 20 and he bought the wii, the wii is a lot of fun, and very fun for adults too, no you do not have to buy more joysticks, there are settings to play 4 player games, with one joystick, however you will have to share, so it does work and we have never had any issues of them not wanting to hand it over so the other player can use it and take their turn, they readily hand it over, it does require you use the wrist strap, so the remote does get thrown in fun games such as bowling and tennis or baseball, and more, so buying another remote just means you dont have to undo the wrist strap, which takes seconds, and hand it off to another, however with four players, you will passing it around anyway, its great to play with the family and others, and just making your character can also be fun and enjoyable, there are many things the wii can do, it can hook to the internet, with parent control, and you can send messages and play games, with your other freinds with a wii too, or it can play alone, with up to four players and one joystick, it is a great game, !!! guitar hero, not sure the purchase thing on it, as an adult, my kids loved it, when a freind of ours had one andlet us have it at our house for a while, he had one guitar, they shared, but it was also very fun to buy the extra guitar, so two could play together, and against each other, however to me, i did not appreciate some of the song, and the backgrounds were mostly of skulls and rock stages, if this does not bother you , then yes its a great game, my youngest son loved it and got really good, they all got good, i even started my own band on it, and it takes you slow through the songs, with easy , med hard levels, even on easy , was fun and we all enjoyed all of us playing, so sorry i do not know the purchasing details of guitar hero i would think you would have to read the box, one guitar is nice, and i do believe it comes with one, but the two guitars was even more nicer, so yeah the wii is great, no you dont need more joysticks, guitar hero is also very fun, some strange graphics, and hard rock songs, and no you dont need another guitar but would be better with two, for more competitition, however we did have a bit more fights with the guitar hero, and one guitar, any way if you have any more questions i would be glad to answer them, my kids might know more buying information, when they are home, D. s , feel free to write and get more info im sure my kids would love to give you their input, enjoy life, D. s ps. i forgot some games you play or buy for the wii you may need more than one remote, like tennis if you play with someone else who has to play at the same time, you will need more remotes, but i do believe the games that come with the wii, only needs one remote, bowling you take turns, so does baseball, so you can share, most games will show one or more remotes on the box if you need to play with more, but to just buy the wii, you should be fine, till you buy more games, D. s