Yeah. I had to change tactics. I had no effective way to stop ranged enemies. But that's just an effect of the big problem...
The striker's job to kill the big threats of the enemy group.
If you look at the striker's list of powers, you'll see that their attacks are basically either one of 3 type:
High damage power
Med damage power with an effect or AOE
Damage and shift/push/slide power
Because all strikers have to do is bring the pain, set up the pain, and run from pain.
Controllers have to messed up enemy tactics. They need:
anti big tough melee guy powers (soldiers, brutes)
anti fast and sneaky melee creature power (lurkers, skirmishers)
anti minion power
anti ranged damage power (AOE damage controllers, artillery)
anti controller/leader power (nonAOE controllers, leaders)
But you only have 2 at will, 4 encounters, and 4 dailies at most. You have to either spread out your powers against a lot of types or foucs heavily on a few type. If you spread your powers, you only get 1 or 2 tries to control any given type for 1-4 turns. If you focused your powers, you put all the weight on your allies and are praying not to see many of the ignored types.
In 3rd, you could grab some wands and scrolls for special monsters and load your lower level slots with special spells and handle almost anything. In 3rd, when you hit someone with a condition, it stuck for a while.
In 4th, you're stuck with what powers you got and force allies to take what you can't handle. In 4th, when you hit someone with a condition, it sticks for a bit.