It's usually a good idea to start by doing what you can to affect a stun or shaken on anything big and ugly hugging the back end of the table. There're alot of artillery vehicles and anti-tank gunboats going around in most codices.
Even if the landraider carries termies, let's face it, we can usually handle termies well enough, and even so, they're usually not a problem until turn 3. Loosing your boats in turns 1 and 2 is a problem.