First of all, HANSEL AND GRETEL is NOT horror but FANTASY in a horror vein. Kind of like the Hugh Jackman flick, VAN HELSING, it is enjoyable as a fantasy/action with horror elements. Entertaining, with a good plot and a lot of cgi (although NOT the crappy SyFy channel shite) Its light, amusing fun if you go in expecting that.
Basically the H and G of fairy tales turn the tables on the witch in the gingerbread house and become dyed in the wool witch hunters stalking their prey throughout the land with some modernesque, "steam punk" type weaponry. Everyone seemed to enjoy it in the theater. Its exactly what I was expecting so no surprises and its basically an action packed romp. I liked it but it wasnt anything special. It WAS fun and entertaining. Expect little and you will probably enjoy it for what it is.