I have my card and I live in Northern California.
It was RIDICULOUSLY easy to get.
I paid $70 bucks at priceless evaluations in San Francisco (where I'm from) and talked to a "doctor" for like 10 minutes about how my thumb hurt from skiing and I needed to smoke to get rid of the pain and walked out with my card. It's only valid for a year before you have to renew it though.
Bud is pretty accessible. So far, I've pretty much smoked all over the city and haven't had much trouble from the police(SF has a bunch of other problems like crackheads and gang violence so they don't really have time to fuck with/care about weed, plus everyone smokes here). BUT they'll get pissed if you're a dumbass about it and smoke in stupid places i.e. around children, crowded public spaces, malls, etc.
But otherwise its chill and no one gives a fuck. And if they do, they don't say anything and just go their own way cause they're not jackasses.
Oh, and not to disappoint you, but "a weed card" isn't actually a card. It's just a piece of paper that you get.