mrkgoo - with Card Ace, we were erring on the side of not showing too much. The actual rules of Blackjack aren't as simple as "everyone in at the end must show" - but either going with the *actual* rules can be confusing, or adding a manual option to muck your cards or show your cards adds another step, additional UI, an additional timer, etc. which were undesirable as well.
It seems like some of the competition has shifted from the "no one shows anything" to "everyone at the end shows", and I think that for most people's purposes, the latter option is more suitable. I'd certainly rather see people's hands so I can get a little more info about how they're playing, and it makes, I think, for a more social game. You can at least learn people's habits in a more detailed and interesting way.
So, we're actually going to try swapping to "everyone in at the end shows their cards" and we'll see how it works. It shouldn't even require a change to the client-side stuff, we'll be able to swap it (apparently) on the server side.
seppo