Its not for everyone, but ive always loved this sandbox stealth/shooter series.
Otherwise BM is a good addition to an old great series. The addition of a newspaper article written about your jobs as kind of a scoreboard is an ingenious aspect i thought was very very cool.
Each mission can be completed in so many different ways ive never seen 2 people really go at it the same way. You can upgrade your weapons in this installment specializing each weapon how you prefer, and thats yet another addition i think was done spectacularly well.
Dont like guns? poisons, bombs, melee weapons, laxatives, and diversions/disguises may be more your path. This game can be played in a wonderful amount of different ways, and has some cool ai coding for its npc's and some of the events, and an original and pretty cool soundtrack again.
Several of the level locations in the game are very cool as usual, once again offering a wide variety of tactics or methods for infiltration at most locations. NPC ai has been softened/smoothed a bit more and will still occasionally freak out over little things, but appeared to recieve attention in the game just like the last game was improved over its predecessor.
I believe this installment will probably be the pinnacle of the series. The company was bought up by another distributer, and new management will most likely try and change up the formula. It would be difficult to improve this game over previous games as well.
If they want my advice, id put this game on a gta type map, and leave everything else the same lol.