Monster Hunter Tri is a hack and slash on the Wii. In this game, you create your own character and you hunt monsters to get paid. Also, despite the small number of weapon types (Long Sword, Great Sword, Lance, Sword and Shield, Switch Axe, Hammer and Bow gun), there's many weapons and bowgun parts.
Yes, you construct your own bowgun. Your bowgun also have it's weight (light, medium, heavy) and normal characteristics who real-life guns got (recoil, range, power, accuracy, etc.). The armors you can wear depends on which weapon type (melee weapons and bowguns).
Also, up to 4 players can play Wi-Fi. The Japanese will need to pay, but the Americans and Europeans can play without fees. Unfortunately, there's no worldwide servers, so Americans can't play with Europeans.
Anyway, here's the game's wiki:
http://monsterhunter.wikia.com/wiki/Monster_Hunter_3