I liked it.
I mean sure, I was eight at the time, but I really did enjoy it. It taught me a surprising amount, too.
The weird pit collision thing, for example, taught me that video games had different physical rules than real life, and that what I was seeing was less important than what the computer was interpreting.
Dropping into pits without warning also honed my reflexes. I became good at levitating before I hit the ground.
The map (in which six screens were arranged as a cube) gave me an intuitive grasp of non-Euclidean geometry, and to adapt to the weirdness and even use it to evade the bad guys. I feel completely prepared if I ever suddenly manifest extra-dimensional mutant powers.
The ever-declining energy stat taught me efficiency. I got good at allocating my time and resources (and I was good and ready for Gauntlet when it came out a couple years later).
And, of course, it taught me to be patient. This allowed me to later beat games like Ninja Gaiden, Battletoads, Zelda II, and Demon's Souls. And college.