Their real edge comes from evoke (you can exile a card of the same color from your hand to cast them for free) which makes them perfect tempo tools that can swing a game before your opponent even untaps
Fortunately, there are a handful of exceptions
Gleemax: A legendary artifact creature from the "Unhinged" set, Gleemax enters the battlefield tapped, but it has an ability that allows you to tap it and roll a six-sided die
While Maralen, Fae Ascendant does technically change that, according to EDHREC, players arent exploiting this potential
Your payoff is Magicked Card, a 4/4 flying vehicle with crew 1, but for that, you need to have at least eight cards in your graveyard, or six before casting this since youre discarding two