Level 1, perhaps. Using an easy comparison, clerics have area options at every attack option from level 9 on:
Cleric
1) Clost burst 3, conjuration that does a close burst 1 every round until encounter ends
5) Zone
9) Wall, Close burst 2, Area burst 2
13) Close blast 5
15) Area burst 2, Close burst 3 Zone
17) Area burst 3, Close blast 5
19) Area burst 5 Zone, Close burst 3
23) Area burst 5
25) Close burst 5, Close burst 2 Zone
27) Area burst 2
29) Area burst 5 Zone
And that's only with the meager options available in the Player's Handbook where half of their options are melee. A year or two from now, the cleric will have area options at every single level choice.
Except for at-wills, everyone gets powers and they're on the same balance scale. The wizard has no _features_ which make him better at controlling than anyone else.
At-will AoE may be sufficient to make something a controller, but seems pretty dubious a distinction compared to everyone else's abilities that work even when they're higher level and aren't using at-will powers as often.