Yeah, I'd say if you're into games of this type, it's definitely worth picking up. Not particularly long, I rented it and finished it over about a week of casual play. That said, there are plenty of choices to make and ways to do things differently, so there's a fair bit of replay value, and I suppose the ultimate goal is go through it without killing anyone, which is quite cool.
Nothing like Metal Gear either. I always feel like the MGS games don't really flow that well, I'd say this is closer to the silky gameplay of Hitman: Absolution. That's not to say the games are alike at all, just that it feels closer to that. Definitely recommended though.