Just finished the game half an hour ago and it's much better than 2, but still not as great as the first. They do a much better job creating a sandbox to play in this time around, but it gets a bit repetitive too fast with the hunting bow just 1-shotting most enemies on the hardest setting. That and you can see every enemy through walls and such, so it falls into the same trap Splinter Cell did of just a mark and execute. Still lots of fun blowing shit up everywhere.
Highly recommended if your PC can handle it!