My instinct is to side with the Threes devs on this, but someone has to say it: It sounds like they spent a year on the cute little faces. Original Tetris didn't do that. Also, I'm pretty sure Tetris was cloned immediately, at least privately, by pretty much any programmer with spare time who played it (because it's fun and easy to implement, like the Threes mechanic).
Is it a good thing that Threes is so hard it's like pushing a rock uphill, until you inevitably can't keep it up and it comes crashing down on you? If someone invented the 15 Puzzle today (the one where you slide the tiles around in a 4x4 grid), for example, but dressed it up and tweaked it so you couldn't beat it, people would probably start having fun with the possible version on the side.
Is it a good thing that Threes is so hard it's like pushing a rock uphill, until you inevitably can't keep it up and it comes crashing down on you? If someone invented the 15 Puzzle today (the one where you slide the tiles around in a 4x4 grid), for example, but dressed it up and tweaked it so you couldn't beat it, people would probably start having fun with the possible version on the side.