I'm not sure who you've been talking to, but considering the 2017 KSUCPM board pass rate is 92% that alone debunks that guy's statement. Most of your heavy partiers who can't take school seriously will be out by the end of the year.
Also, I'd wait until you have more than a couple of days under your belt before blasting an entire program. I have my complaints about the school (as I would about any school), but a vast majority of people get through fine and land decent residencies. Both Tim and Eble are very approachable, so talk to them if you have issues. Medical school is a huge jump from undergrad, so there will be a transition period before you're acclimated to the workload.
Also, take what people say with a grain of salt. Always. No matter where you go, people are going to talk about things they don't know anything about. As a rule of thumb, don't rely on what upperclassmen tell you (and I'm saying that as an upperclassmen). A lot of their advice can be helpful, but all our perceptions are biased by our own experiences. I've received both great advice and not so great advice from my upperclassmen. I take it into account but I ultimately try to pave my own way.