Maybe it's just me, but I find that Nintendo's games, though they are 5 times as expensive, take about 5 times as long to play through and/or complete. I mean, I really like VVVVVV, and it's about 10% of the price of NSMB2, but it only takes about 3 hours to beat the main game, and the bonus quests are generally garbage. NSMB2, though it lacks the ingenuity of VVVVVV at its best, is much more consistent, takes 30 or 40 hours to collect all the star coins, and also has Coin Rush mode.
So, in short, I'd say that both games are appropriately priced. Maybe I'd think differently if there were more cheaper games that could match the Mario style, but there aren't. Most of the Great indie/downloadable platformers avert Nintendo-style tropes and mechanics, so that they simply play differently.
Love and tolerate.
