lol Kitoky wine
What makes Inuyasha so good is that the story is good and you have a good character like Inu. He's not a "goody goddy". He has major flaws. He gets high minded and sometime doesn't want to listen. When he makes mistakes, we want to see how he's going to get out of it.
Plus, look at the episodes. The entire show started off with a simple mission: to collect all of the jewel shards.
Kagome came with Inu cuz she could see them and locate them while Inu could fight and protect her.
Now we've had several characters join in the fight. Shippo, Sango, Miroku have all joined and each have come with there own story to tell. Miroku has a wind tunnel that will eventually kill him, no thanks to Naraku and Sango's family was killed by Naraku.
Then to complicate matters, we have Kikiyo roaming around, popping in every so often. That keeps the show going.
This show is awesome, so don't even get me started.