[JohnG]

Given his stack, he made a mistake raising the minimum preflop. All-in is probably his best raise.

I haven't looked closely, but on the flop his call looks pretty close to being ok. Not too bad, and most people would check an ace in your spot, so if he doesn't give you the ace, it is a good call.

Preflop, your choice is normally re-raise him all-in or fold depending on whether you think you are best or not. But as you were the BB, you could just call if you think you have the best hand, with the intention of betting all-in on flop when you miss, to maybe get him to fold hands that had you buried in the event you were wrong and not ahead. i.e. AJ, AQ.

You also have the added bonus of him maybe folding a small/medium pair when you do this, (but that isn't a reason to do this by itself when you have 2 big unpaired cards).

On flop, if he's a normal player, he will usually bluff at it if you check. Which is why a lot of players check the ace there. And if he thinks that too, then he didn't necessarily give you the ace, making his call a good one in his mind.