The graphics aren't much, but the bystanders, cars and buildings look pretty good. The night and day cycle has been presented with interesting lighting effects. Looking at the two status bars won't really give you all the thrills you might expect. The designers tried to achieve the effect of adrenalin-boost you get from action movies, but it seems that they failed there. In fact, mission planning and design present the most interesting part of the game, and the real action has been totally simplified, not that it doesn't feature some exciting action segments and gunfights.
Heist is an interesting game, primarily because of the game concept.
On the other hand, I can barely think of any reason why I would recommend it to anyone. It does feature good voice acting, but you'll soon get tired of those, as they are pretty monotonous. The dialogue windows are particularly irritating, as you cannot close them before you read the contents, even if you read it before. I guess you should try Heist on your own, if you found anything appealing about it in this text, and decide for yourself after you finished a couple of missions. Easily fill in your friends' emails to send them this page.