Yeah... I can see their argument, sort of, but only in a vacuum. In comparison to, say, Magic? It's a great game, don't get me wrong, but a competitive deck (in pretty much any format) will run you about as much, if not more, than the entire A:NR card pool.
Sure, someone with more cards can do more things. But not to the extent it sounds like they're implying?
I dunno about core-only taking down complete card pool, add in the rest of Genesis cycle and the odds are better...
But, I mean, how many runner decks are out there -- good, solid decks -- that don't use any cards from Lunar cycle, at all? It's more than just a couple.