Actually, Superlaser Blast is an action, so you can play it on your opponent's turn at the end of their refresh phase. It will be too late for them to flip over a new objective, so they will be down one resource and be less able to mount a strong offensive against your objective. It would be a shocking way to start off a game.
Plus, if you had a bunch of ESPO troopers floating in your deck, you could lay a couple of them down for free, so you have some defense, and still fire your superlaser on turn one. If you drew into enough free allies, you could even commit one to the Force to put the pressure on your opponent to do the same.
Superlaser Balst - Play only during your turn. Action: Destroy a target objective.
Good point on the Espos, but since the OSet is limit 1 it could make it difficult to gather enough in your opening hand.