I think this game is quite entertaining. The graphics aren't "beautiful", and I don't mean that as an insult. I think this game is a great example that you don't have to make a game look as slick as, say, William and Sly 2 to make it addictive or enjoyable. While it certainly isn't an easy game, I think the stats are a little misleading because you're going to have to slaughter A LOT of pigs just to figure out the layout of each level, particularly as you progress in the game, but also depending on your strategy. The game is clearly well-thought out, challenging, and has decent replay value.
I also really appreciate the fact that the level selection screen will allow you to resend medals later if you weren't initially credited. Especially with a 'beat the level' game, this should be a must. Between people's own computer issues, NG's medal issues since the redesign and occasionally programming errors, this keeps gamers (especially medal whores like me) from abandoning a fun game because there's no payoff.
I would recommend this game to just about anyone, not just animal-killing sadists!