He's definitely done a good job with the 70's adds, and some of the themed weekends. There is good energy at the station, and I disagree with all the people bashing the mid-day guy he hired because he was his friend. He sounds fine to me.
At the same time, he doesn't seem to do much with the 60's stuff, the DJs are TERRIBLY scripted and unnatural, and he keeps tinkering with the jingles. "Constant music" does not exactly flow as a little bumper.
His biggest crime in my eyes is the Christmas season. The jingles become KOST-y soft, and suddenly we're hearing Cliff Richard and Barry Manilow three times an hour. It's a shameless attempt to steal ratings from KOST, rather than offer something DIFFERENT, which K-Earth used to do. Probably repels just as many people as it attracts, and undermines the station's core audience. Ratings were up last year, but they were up all year long, so that doesn't really tell you whether "KOST-izing" was a good decision.