Given that so many warlord at will attack powers are very, very situational, I don't have a problem with the idea of taking Opening Shove and Commander's Strike, and then just doing all my own attacks with basic melee attacks or encounter powers. Viper Strike or Wolf Pack Strike are basically just basic melee attacks anyways, except in certain (unusual for my group) conditions.
I have some really great ideas for a pyrokinetic warlord* that I'll want to try once Martial Power comes out. This at will works well with the idea.
*Start with a firesoul genasi, reskin as a human with pyrokinetic powers. Take the wildfire soul paragon path, since it gives you implement free fire powers. Then multiclass into spellscarred, which again is reskinned as your pyrokinetic powers. Use your multiclass to add more implement free fire attacks. Partner with a two handed weapon Fighter, use Commander's Strike as your primary choice of action, and help maneuverability with Opening Shove. When dealing with groups, incinerate them with your fire powers, and when dealing with individual foes, use your absolutely brutal tactical warlord powers.