Are people really that concerned about players "wasting" powers on minions? I don't think this is a valid fear due to the rest of the system for monsters. The bloodied mechanic will quickly teach players NOT to open with their big guns until after a monster has been bloodied.
Assume an at-will does 1 hit worth of damage, an encounter power 2 hits while a daily does 3.
Let's say you have a monster that can be taken down in 8 hits. This monster has no "Bloodied" trigger a la the gnoll and the angels. Mathematically, there's no difference in opening up with an at-will and then using encounter/daily powers when compared to the reverse method.
The monster in both cases will be dead in 5 rounds. However, there's a huge difference if the monster is one that has a "Bloodied" threshold trigger. Opening up with an encounter means that the PC will be subject to 4 more rounds of the monster at usually a STRONGER point (the gnoll for example), Whereas if the PC is smart and opens up with at-wills until the monster is bloodied, it only has to worry about facing a bloodied monster for 2 more rounds. I know which one I'd prefer.
This even works if the monster gets *WEAKER* at Bloodied like the Angels. Encounter powers unlike dailies can be whiffed thus it is better when facing an angel to *WAIT* until the angel's defenses are weaker than to start the battle with an encounter power.
So wouldn't the proper tactic pretty much always be "use at-will powers?" until at least the monster is bloodied, which means that the players never waste an encounter power/daily on minions?