hong said:
Well, take a warlord with that super daily power that adds +5 to attacks for the rest of the encounter. Add Armor Splinter and Wis 20 for another +10 (effectively). Add flanking for another +2, so the total is +17 on your normal attack. If you normally need a 19 to hit Orcus, you now hit him on a 2.
Well, level 30 Ranger: level + magic + feat + strength = 15 + 6 + 1 + 7 (16 base + 6 stat ups). Total to-hit of +29; Orcus has an AC of 48, so to hit him on a 2 we go: Warlord +5, Armor Splinter, Flanking (though if both Armor Splinter attacks hit, flanking is not needed) or Combat advantage. Die roll of +2 (1 is an auto-miss so we don't care about it).
Yup, exactly like hong just said. 41.812033523% chance of 16 attacks; 37 damage per hit (1d10+7(str)+6(magic), 2W gives us 2d10+26 per hit, or 11 avg + 26 = 37 avg damage per hit.
37 avg x 16 gives us 592; this math does not include, say, being a Divine Trickster and using your re-roll ability (I believe they get two). That raises the probability as well; frankly, a level 15 power that does over 200 damage is stupid, even if its a daily. Sure, it spends an action point, but its not like those are any kind of finite resource.
Basically as long as you miss on a 1, 2, or 3, the power is balanced. If you only miss on a 1, its broken.