Surprisingly fun
This was much more addictive than I expected it to be. You read 'Pong' and think 'Not this again' but the combination of sound effects, amusing (if not a bit too few) messages and actually rewarding game-play all added up to a decent game.
It's not going to win any innovation awards, or graphics, or sound, but for what it is, it's a fun game. I actually felt joyous after beating some of the harder levels, something which many flash games of this sort fail to do.
I was going to say it was easy, but once I got deeper into the game I really felt the difficulty.
Overall, a surprisingly good pong clone.