Most of what you mention (jabs, tatsus, dive kicks) have been nerfed, with the exception of Cammy’s jab pressure, which I personally don’t find to be that big of a deal since it’s easy alpha-counter bait. The “we will guard for you” gems were drastically nerfed to the point that I’ve yet to see more than one since the patch, so that was probably the big change that really improved things in my mind.
To be honest, I don’t think the game changed that much outside of those things, as much as it is the people playing the game that stuck with it have gotten better for the most part. People started actually utilizing the tools that the game makes available, and even now there’s folks that are seeing ways to make Pandora more useful than it initially seemed.
All that said, there is supposed to be a larger update due out soon that will rebalance things again, but it’s likely not going to happen until after the 25th Anniversary tourney series is over, so there will likely be more positive changes in the near future too.
Best way to get a good sense of where things are at now would be to check out some of the vids that have been going up from the online tourney series, or ssf4evo’s channel, or of course, JiBbo’s channel.