My brothers friend says it's good but is it it's just kill kill kill kill equip then kill kill tahts about it so is it that goood =-O

no.

Depends, if you like hack & slash you should try it. But yes it's kill kill kill, find usefull stuff and trade it or use it for yourself. And kill some more. Then you could also do MF (MagicFind) runs on any particular boss of any act. I sugest you do this on the hell difficulty since you'll get the most funky stuffs.

To be honest, I am in the middle of the battle against Andariel when I played as a Paladin. I am no match to that monster ^_^'

It kept me playing for something around 3 years. The key is to not let the game end after you have beaten it a few times. There is so much more to it than just that, especially in online play. If you are only playing in single player you don't have a clue what you're missing out on.