Except having creatures untapped is itself valuable.
Often enough, you don;t want to swing with the team because committing to attacks gets your dudes killed for nothing, or trading down, and opening yourself for the counterattack is worse than the benefits of attacking are good. In limited, this is a pretty common game state: the staring match at parity where someone has to pull a trump before anyone does anything, because otherwise the defender is the person who wins out.
One way you trump that mess is with evasion, but you're unlikely to have many evasion creatures, so you often start bleeding an opponent with just one flier. Exalted is pure value there. And if you don't have the flier? Exalted enables you to send one junky creature forward and either get damage through or get it to trade up rather than down, while maintaining the defense that keeps your opponent from doing the same thing.
This, frankly, almost goes double on synergy with unearth. I like the idea of swinging with a 3/2 temporary dregscape and, when the other guy inevitably takes 3 rather than losing something real to a 1-drop that's going away at EoT anyway, dropping Fleshbag and just laughing it up.
Outrider is, I fully admit, not the best card, but exalted does NOT have a required critical mass to get use: if you're meaning to alpha strike rather than plink away with a creature, you're winning anyway, and if you are at the parity/plink away phase, even one exalted on the board gives you expanded tactical options and/or a faster clock.
+1/+1 is not that valuable. thus, I will not keep a creature back to block for it
unless I would have anyway. if you're holding back good attackers for one exalted trigger you are playing wrong. so yeah, sometimes it'll be right to swing with just one creature. and in those cases, Outrider is marginally better than
grizzly bears, a card that's only ok and costs
less. but there'll also be times when you need to get aggressive in order to win, and your 2/2 for 4 will not help you there. you also have to remember that parity board states don't just magically occur, they're manufactured. and they'r manufactured by strong defensive bodies that make attacking not worth the cost. and a perfect example of a card that does not do that is a 2/2 for 4. you're running cards that are only good in a specific game state and do nothing to help you reach that state. in every other state (racing, turtling, building up, anything.) Outrider is awful. in a board stall where you have
exactly one evasive creature, Outrider is the world's worst anthem. that's its best case scenario outside a dedicated Exalted deck.
your arguments are for the qualities of Exalted on good cards. like, I would run
rhox charger as my only exalted source. because it's a good body on its own. when I find myself being able to use its exalted, that's a nice upside, but when I don't, I still have a tramply hill giant. that's strong, and it works great in all the situations you described as well. but when it's
only useful in that narrow band of board states? yeah that's a bad card.