THE ANSWER IS BLOCK, YOU FOOLS.
LIKE BLOCK CAPITALS, AND BLOCK TROLL, AND BLOCK OGRE.
Every turn you want your big guy to do something? What you want him to do is anchor your line and support your mans. Block, guard, stand firm. It's not rocket surgery, but it is awesome. Everyone* wants a big guy with block, the +str and pro are luxuries for afterwards.
*except possibly skaven - I'd take claw first on a rat ogre, follow with juggernaut, and just gleefully frenzy around wrecking players up - and minotaurs, if you're a) taking the minotaur and b) making an active mino instead of a tentacle one - although if you get a double that's a good prompt to change your mind and go for a block and tentacle mino instead.