Yes, they could have lower metabolic rates... but they're still having to feed them ready sources of meat. Though there were large herds of buffalo in the Plains, those tribes which hunted them for meat usually followed the herds during the period. . . and didn't have to supply meat to themselves and large hungry dinosaurs.
Well, assuming either extant megafauna or the huge buffalo herds, the riding raptors (or their Moa descendants) could still pay off (assuming you could train them for riding, of course). Smart, fast and equipped with fearsome natural weapons of their own, they'd naturally take down that kind of prey in small packs of 5-10 creatures. Now add in the human element of sophisticated tactics, ranged weapons (bow, axe and spear) and riding techniques analogous to what we see in horsemen and the hunting party becomes (potentially) more efficient than a RW one. Get in close, use your raptors to cut a target from the herd, use ranged weapons to wound it, and then take it down- either with your own weapons or letting the raptors take it down themselves. Getting that meat supply wouldn't be that big an issue.
Something as big as a true Moa or midsize raptor would be the equivalent of a tank, and a tribe might only be able to handle a small number- 2-5 beasts total. But they would probably develop tank/armored knight style tactics to go along with such critters if they had them- a couple of riders with ample ammo supported by "infantry."
As for the smaller raptors or carnivorous flightless birds, using packs of them to hunt with would be no more a problem than using hunting dogs. That's just a matter of flavor.
Remember that while reptiles of all kinds prefer live prey, most don't turn their noses up at carrion. Some scientists propose that some of the raptors and carnivores may have even preferred it- its an easy meal, after all, that entails no risk of injury...and reptiles have fairly robust digestive systems.
The moa idea isn't that bad either; they fill a similar ecological niche to horses, they supply useful materials (decorative or fletching feathers, molting down which could be preserved for clothing, good source of protein) and with their herbivorous nature and birth cycles they can be used as herd, pack, and riding animals. The smaller varieties (heavy-foot) were compact enough to be highly useful for a herding animal, and perhaps such creatures lay in large communal nests and pad them with materials (like eiderdown.) This could provide for a reason for travel (the collection of young and their nests) and provide for an interesting cityscape. Moa excrement may be similar to guano, and the human tribes may have a pretty heavy connection to fire due to the prevalence of this Fireball 'ingredient'.
Nice!
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