I own ET.
I didn't hate it when I was younger. I just couldn't figure shit out, and thought it was my fault that I couldn't do very well in the game. It made me feel bad and made me hate myself.
It really is a terrible game, because it's an unfinished, poorly designed piece of shit that somehow made it onto store shelves.
According to X-Play, after you beat the first level (the only level) you're taken to a minigame of Pong with only one paddle.