As a huge fan of previous games, my expectations were quite high. I've bought Full Experience quite recently, and I already played for around 85 hours. It's good. It's really all I have ever wanted from Hitman, although there is a lot room for improvements.
I like almost each map, especially Colorado, Sapienza and Hokkaido. Bangkok is really great for social stealth, but SASO run ruined it for me, it was tedious and not very fun. Paris is nice, but for some reason, I'm not very excited about this level. Making game some sort of sandbox really fits Hitman and replaying levels is fun. As well, this is the second game in my life in which I really enjoy improving my runs, getting better times and compete in the rankings (The first one was Mark of the Ninja, I highly recommend this game!).
Marrakesh, when I first read about this level, I was excited about the concept, but this level was just simple, I've killed first target SASO in ~5 minutes after launching this map for the first time. However, embassy is cool, but overally this is my least favourite map. It's interesting, I've read people complaining about Colorado and saying it's the worst episode (when I've liked it) and saying that Marrakesh is great. Maybe it's all about taste. To each their own.
Escalations and Contracts - these modes have really huge potential, but it's untapped. Most of Escalations are unnecessary long, force you to complete the same thing few times for no apparent reason. They should be shorter. Contracts - lack of "latest contracts", lack of rating system, no option to change names of targets, contracts' names and descriptions and so on.
I haven't played much Escalations (two), so I won't rate it for now.