Before I start, I just want to say that I really enjoyed this game. The plot's fantastic (the game IS the plot, so it has to be really), and the graphics are just gorgeous. The black and white drawings of the characters looks perfect, and very sophisticated, although they're limited - the animations aren't very varied, and you've seen them all before you've played the game for an hour. (My favourite? Kyle's smug grin - cracks me up everytime!) The 3D graphics are pretty good as well.
The plot, as I've mentioned, is amazing. It's intriguing, and it manages to mesh everyone in the hotel together very neatly indeed. The characters are very well written, and they never seem to slip out of character. The game's humorous, as well, so it might make you chuckle every now and then, which is always a bonus. Despite this, I did feel like there were points that were a little contrived - how everyone in the hotel somehow managed to be involved in the main plot.. a very large coincidence, and not very believable.
However, I do feel like the game is a bit too much like a book. An interactive book yes, but more like a book than a game. You will spend 90% of the time scrolling through dialogue which you can't control (half the time when you do actually have to input something to a conversation, what you say makes no difference, or any answer apart from the perfect one will get you kicked out. So there's not much leeway there.), and the rest of the time is spent solving fairly simple puzzles. (a jigsaw puzzle. Yippee!)
I personally really enjoyed the game, even if I finished it fairly quickly, but I wouldn't advise players who are into more action games to buy it, as you have to sit tight for the majority of this one. Also, people who have a short fuse may feel a wee bit annoyed when having to sit through the dialogue again and again and again because of Game Overs.