Mini

1. i'm using rechargable AA battery, not the wii style ones.  if u play wii a lot, i think you should get a rechargable batteries.  it drain out the battery fast.  i won't get the ones that you need to place your remote on the charger in order to get charge.  coz that means when you are charging, you cannot play.
2. i think you are talking about "wii play".  if u like to play those games, it worths gar.  it's like buying a game for $15 only.  so depending on your preferene la.
3. i didn't get extended warranty.  it comes with a 1 yr warrenty anyway.  if u register online, you get an extra 3 months warrenty.
4. you can fill in those online forms after registration to get your remote jacket (it just ask how many remote you have and they trust you. i only fill in 2 and they sent me 2).  but they are ugly.  you may not want to use them.