I'll ask my friend who knows a lot more about patent law to give his thoughts. The rectangular design with round corners thing wasn't the issue here, that's just Samsung being sarcastic. These things are odd to take to jury because of how technical they are, but it's a quirk of the system. The damages will get reduced on appeal either way. Some have said that they can use this verdict against others. They can't legally use it, although they may scare others. It's entirely possible that another jury could have decided this differently.
Anyway, I don't know enough about patent law or the differences between their designs to accurately give an opinion. At least the jury here got instructed on the law. I'm curious how this will affect the future for smart phones.