He's a good player no doubt about that.
But you'll should consider a few things first.
1. How he'd fit into your current team. (A player is only as good as the players around them.)
2. Whether you can't get someone else like him for alot less.
3. Whether putting all your money on just one guy is the smart move. (99% of the time, it isn't.)
Injures, suspensions and bad form are all things that can kill a team that does have the depth.
So, to sum up, I wouldn't buy Gotze.