Sorry to say this, but its that they're not great quality.
I know, site admin shouldn't moan about rubik's products, but the fact is that the original 2x2 and ice cube have very poor turning quality. However, the cube exploding isn't normal. I've had it happen only once. That was a storebought 3x3 that I got from Argos. They swapped it straight away.
Most people I know use Lan Lan, Ghost Hand or V-Cube 2x2s. There are others out there and I heard an unconfirmed rumour of a new mech Rubiks 2x2 that sorts out the turning problem.
Please don't ask me for links to where you can buy the other branded puzzles. My admin leash only goes so far. I'm sure google is your friend here.
Please take off topic discussion off this forum. Thanks.