It's not that I feel pressured to time contraints by ambuscade is that the event has never been much fun and after frog it kind of ruined it for me.
This month, summoners and rangers work. There's no reasonable reason, that I know of, that other jobs don't work, they just don't. Summoners, you're limited by BP cooldown and rangers, to be honest, I don't even know any good ones.
I've tried a few melee oriented strategies, but Amnesia and that BLU boss' aoes hurt, not to mention the WHM needs to watch me for Bio.
I think it's cruel to limit the weakness to vastly underreprsented jobs.
As for Omen, the twenty hour cooldown is baloney.
If I were to design an event like Omen, you'd select your group style when you entered (melee, mage) and you'd get one of a random array of bosses based on that choice. Each type would present a reasonable challenge to the chosen style and unforgiving to the opposite group ("mage" oriented bosses would have brutal small range aoe attacks, physical oriented bosses would reflect spells cast on them, or both could take reduced damage from the oppositing strategy).
The lockout needs reduced, and please don't say we'd burn out too quickly. These are all recycled mobs anyway. I don't care what the caturae's name is, it's still a caturae more or less.
The "fun" of Ambuscade leaves the room after the second or third takedown each month.