The pitch deck is only good if the concept, team, and opportunity are good. A pitch deck should not be hard to put together if you have those three things on your side. If you do not, no slick pitch deck will really help you.
Not that I have first-hand experience at successfully pitching for huge money, but I completely agree. A lot of successful companies have average pitch decks but have great content on their side. One takeaway I've gotten from this side-project is that with pitch decks design doesn't matter but story-telling does.
The archive of pitch decks is really just post hoc confirmation of what were excellent, well-timed, and well-executed business plans. Imagine the thousands of great pitches that didn't end so well. I have seen many excellent teams with great pitches that failed for reasons entirely outside their control and reasonable ability to anticipate.