Starting this game?

Guys i wanted to play this game with a friend. Do you think it is worth to play it with friends ? Contras and Pros?
i mean are there many options for the character like many Weapons ?
How is the Dungeonsystem?

yes it does more fun to play with friends
DG system just like usual, except rare drops are more obtainable in party and hell mode
DG level 65+ mostly have to run with 5 players...
i think it's impossible to run DG 65+ party or hell by solo-ing... :)
Have Fun :)