I fixed that for you.
I'm surprised I actually got support on this point. =P
On the invoker, are you talking about Divine Bolts? How the HECK does Divine Bolts deal more damage than a striker? That's absurd. Level 5...2d6 + 14 is still less than 2d10 + 4 + 1d8 or 1d4 + 2d8 + 10...and the striker can still put it all on one target. If anything, I'd say the Invoker is an example of what the wizard shoulda coulda woulda.
If you're not talking about Divine Bolts, I think I misread the class or something...they still suffer the same limitations as the wizard with "you wind up hitting your own guys a lot". Wizards have a feat tax to get around stuff the Cleric gets around for free, with twinkies.
...
2d6+14 = average 21
2d10+4+1d8 = 19.5
1d4+2d8+10 = 21.5
So, the Invoker is in front of the ranger and just behind the rogue who must have combat advantage to deal the damage. And this is the worst the invoker will "ever" get in damage.
The invoker has powers that only hit enemies:
Level 1 Encounter: Astral Terror 7x7 squares 1d6+7+#enemies* damage VS Will
Level 3 Encounter: Sun Hammer 3x3 squares, 1d10+7+#enemies* damage VS Fort, +2 extra damage if you have a bloodied ally in the area.
Level 1 Daily: Angelic Echeolon 7x7 squares 1d6+7+#enemies* +5 damage if they attack, vs Will
Etc...
The damage might not look spectacular, but on a Human invoker having Action Surge and using an Action point it hits really hard. At level 1 he regularly hit all my mobs with his daily (+8 to hit VS will), doing 1d6+5+7 and the mobs took 5 more damage if they wanted to do something, so 20 damage x5 = 100 damage, and then he followed up with Astral Terror for 1d6+5+5 = 13.5 damage to 5 enemies (2 were minions that are now dead), so another 67.5 damage, for a total of 167.5 damage in one round.
He can offcourse not do this every encounter, he usually only hits 2-3 mobs at a time doing about the same damage as a striker (more if he can hit 3 mobs). When he novas it is spectacular.
The only time he does less damage than a striker is if he can only hit one mob. Usually, that is NOT a problem, because that usually means all the other mobs are dead. It happens maybe every 10 encounters (solo mob).
*Class Feature: Covenant of Wrath -> Covenant of Manifestation.