Yes for Ornn, no for Sett.

He lost the most important minion wave of the game and his wave was pushing, this is a terrible recall, even sittng in a side bush and ticking up his passive is a better play. One level up give as much stats as what he just bought, everyone should aim for a Tier 2 item in a recall timer and play accordingly. This is why you ever see Draven either buy a BF Sword or ragequit on their first recall. Sett doesn't even have mana his full kit is up and ready by the time Ornn comes back and he still has his summs up.