I'm not sure I agree re the AP ability and Radiant Servant (warpriest, yes, though it's highly variant; +1 to hit and 1d6 is -usually- going to lose to 5 damage [and it'll get worse over time, as the warpriest damage scales], but if you assume you're going to attack 3 times on a nova round ( AP attack, standard action attack, minor action attack), +1 to hit and 1d6 damage 3 times might beat your level in ongoing damage--at least until you factor radiant vulnerability in or get up to epic levels [of course, when you hit epic the crit feature becomes pointless, and even in Paragon, given that I'm talking LFR, I can load up with Lucky Shot cards]
Also, I think the U12 will also work with the level 11 class feature (useful when there's a multiattacker in the party who's a better recipient than you are; you're often the best recipient, but not always).
But yeah, it's basically a question of superior powers vs superior features -- which IMEX is -heavily- dependent on how long you expect fights to take. OTOH, there's something to be said for a striker dipping for -superior- limited leading capability (ok, RS is a dip for weak leading and superior crowd control, if not as superior as it used to be), not to mention getting good power without doing the same thing everyone else is doing (though the call of Radiance increases the higher level you go).
Also, I think the U12 will also work with the level 11 class feature (useful when there's a multiattacker in the party who's a better recipient than you are; you're often the best recipient, but not always).
But yeah, it's basically a question of superior powers vs superior features -- which IMEX is -heavily- dependent on how long you expect fights to take. OTOH, there's something to be said for a striker dipping for -superior- limited leading capability (ok, RS is a dip for weak leading and superior crowd control, if not as superior as it used to be), not to mention getting good power without doing the same thing everyone else is doing (though the call of Radiance increases the higher level you go).