Trust me modding your wii is the best thing you can ever do. You'll enjoy modding your wii more then playing the games made for it. Trust me. I have over 219 games on a usb hard drive and only have beaten New Super Mario Bros so far. Owned my wii since November of last year. You can use emulators to play all classic consoles like SNES, NES and Genesis.
Watch movies on your wii. Go online without being banned. Listen to internet radio. Also you can download Nintendo's entire Wiiware collection (Similar to xbla games). Wii has some very good games to play. It's not for hardcore gamers but casual and family. There are probably around 20 top notch titles for the wii and many good casual games. For hardcore, stick to the xbox 360 and PS3.