I recently purchased Mansions of Madness and have played 2 games already, we all had great fun and the game kept everyone entertained (adults and children) for the duration.
The game sets 1 player "the keeper" against the remaining players "the investigators" in a race to solve clues that will unravel a hidden mystery. There are a number of scenarios to play and each have different maps set up, clues, puzzles, events and monsters, so there is a lot of variation.
The game does have a lot of depth but younger/inexperienced players can still take the roll of one of the investigators working together against the keeper, where gameplay is quite intuitive.
Rooms, Cards and models are all of high quality and are very detailed. There are quite a few parts to this game but I found separating tokens and cards into their own bags and pots helped keep everything organised.
The only downside I found while playing was the amount of time required to set up (placing rooms, cards, objectives), this is mostly done by the "keeper" however, so it is possible for this to be done before hand to reduce the waiting around the "investigators" will do before the game begins.