I don't know about that, because I don't know how accurately you have to aim the Wii remote in order to send the ball down the lane straight. Somehow, I kind of doubt that it could help your game in real life, but it's still worth playing when you can't get to the local bowling alley. ;~)
I'm with mandabear and shadee; I don't really think the video game will do anything for your real life skills, but it's still fun. I have that game for my Wii, too; it's the one with several other sports on it, as well. (But the bowling is the most fun!)
I've played at a friend's house. Of course you can't compare it to real bowling, it's something totally different, but it's a really funny activity and you can waste some time by playing it in a rainy day.
If you want to be a better bowler, just play the real thing more often. Playing it on wii is totally different thing...you don't even have a ball, this is just a fun activity for you to play inside your home.
Bowling on the Wii is great. It' my opinion and I'm sticking to it I love live bowling but I don't always have the will to get out of the house. I know it's not the same but at least it's something. Bowling inside your apartment, for free, where it's nice and warm.