Brilliant!Not actually true. There was a warlock At Will, Eldritch Strike, that you could take in place of Eldritch Blast and counted as a melee basic attack. (It did 1[W] damage with a slide of 1). I don't think there were any other melee weapon attacks - but staff wielding warlocks were common.
More importantly there were a lot of close AoE attacks which you could use in melee. SOP for a feylock in a party with a fighter as encounter powers was for the Fighter to use Come And Get It right in the middle of the enemy to get themselves surrounded. Then on their turn the Feylock would use Fey Switch to switch their place with the fighter. And then use a power I can't remember the name of to make an icy teleport out of there, doing cold damage to all the enemies who had been around them and immobilise most of them. And then with the enemies frozen to the ground in the wake of the warlock's escape they were all nice and set up for the wizard to drop a scorching burst on all of them at once.