Wild Growth is definitely underplayed, too. It makes sense that it's in more decks than
Overgrowth, perhaps, but not
Cultivate! It's the same as a
Llanowar Elves if played T1 (except as an enchantment, much less likely to get wiped), and better if played later (notwithstanding synergies; green decks are liable to have
Beast Whisperer type effects or want to win with a Craterhoof, etc). But in pure ramp terms (certainly for maybe two-colour decks not looking to win through creature stomping) it beats dorks, and its certainly faster/better than three-mana ramp.
Overgrowth I prefer to
Cultivate too, except maybe in decks of many colours. It ramps you more, and if played once you have 3 mana + land, it can be tapped immediately to give you back two of its casting cost. However
Cultivate fixes your colours way better... but then so does
Chromatic Lantern, and most people are shunning that now as not good enough any more. I think that
Cultivate's stats are probably inflated however because it's well-known and has been reprinted a lot, so it's not really a fair comparison. It's not that great and outclassed by a lot of options now, but still shows up a lot.
Utopia Sprawl is good but the decks that want its fixing the most are less likely to have many forests. No problem running it as a kind of
Wild Growth in two-colour, in fact it's probably even a bit better there (you can choose green after all), but I wouldn't really want to risk it in 4-5 colours unless maybe it's a very green-heavy deck that just wants to splash for the odd other thing.