I think the fact that Satoshi Dice is a gambling service is what's clouding your judgment.
Imagine if NOBODY knew what all of these transactions were being used for. Then what would people say? Would they still be complaining about too many transactions? At the end of the day that's what this is all about. How many transactions and how much space do we want to store on our hard drives?
Disk space is CHEAP, and getting CHEAPER, and there are ways to innovate storing and downloading the blockchain. The idea that bitcoin should be hardcapped at 7 transactions per second is so ludicrous I really can't believe people are defending it at all.
It's not about gambling, it's about how expensive their implementation is. They outsourced the cost and they're not paying (enough) themselves.
Reread this:
For an easy analogy, this would be like WalMart charging your credit card for every item you pick up off the shelf, and refunding you if you put it back (actually worse, since SD uses 2 transactions for every action).
Not even VISA/MC could handle that kind of abuse, and their system (being centralised) is far more efficient than Bitcoin.