[Chris]

The problem with the Battlecruiser is that it isn't ment to be used as a war-in-a-can unit, like Red Alert 2's Soviet Apocalypse tank (has daul cannons vs ground, and dual rockets vs air). It is too slow, too much supply/vespane and minerals, and you literally need to consume 1-2 nodes just to build up the BC army. And even then, you would probably be attacked, long before the first BC was produced.

The real purpose of the BC is it was ment to be used as a backup weapon to punch holes in defense, or take down tough units like ultras or carriers for your more useful units.

Yamato does the above. The barrage rockets is only good for dealing with the weaker units that your more fragile units can't contend with.