Oh, I like the fact that Uncle Ben showed that principle to Peter through his actions rather than just saying the words. People get too hung up on the line itself; the words aren't as important as the idea. It wasn't even originally Uncle Ben's line -- it was the last line of the narration in the original story, summing up the lesson Peter learned from Uncle Ben's death and his failure to stop the burglar who later killed Ben. So whether or not Ben actually said the words is trivial next to that. The actual phrase itself didn't start getting repeated in the comics until the '80s, so it's not like it's some indispensable catchphrase. And it wasn't attributed to Ben in the comics until 1987, although an audio story on a record album had done so 15 years earlier: http://www.cbr.com/when-we-first-me...-with-great-power-comes-great-responsibility/
Like i said, I only saw like 20-30 minutes before getting bored and changing channel, so I don't have a fully formed opinion.
All I know is there was this scene with Sheen who was clearly supposed to be giving Peter the "with great power..." speech, but phrased slightly differently and it was painfully obvious what they were doing and it just felt awkward as all hell. There's a reason that phrase exists: it has an eloquence to it that sums up a whole philosophy in a single sentence.
Now you can show instead of say, sure, but you can't explain it differently and expect to have the same effect. It just makes it feel ironically derivative.