I actually really like what I'm seeing out of him. However, he isn't getting the same elevation he was getting in the 2012-2013 season (which I guess we have to come to gripes with), but more importantly he looks slower/can't get to the paint as easily.
However, keep in mind he never looks that great in preseason. And it is preseason after all. It'll take him a few months to get back to actual Kobe, if that's still possible.
And yea he got crossed badly by Burks, but overall Kobe's defense has been good. Hopefully he sustains that throughout the season (this I'm doubtful of, unless he's going up against another star
).