This is the best game ever created and one of those games that comes around meaby once every decade. You'll get somewhere between 200h - 1000h of playtime and free online coop gameplay. This is the absolutely best game ever created. The story and the world are also absolutely mindblowing. The siqequest and other things to do in the game are also intriguing and brilliantly made.
My suggestion is to just check it out on youtube or check the trailers in the Wii U store if you already own a Wii U.
Exploration trailer and battle trailer are good, but also just some skell (mech) gameplay can give you a feel for the game.