22 slips quite well. All other things you said are true, but it does not require many hours to get used to. It's a pretty easy plane to fly once you account for a few things. Many of the proficiency issues revolve around more complicated avionics(vs non G1000 172). This can easily be practiced on a computer. Otherwise be on your numbers, don't get slow, learn emergency(kind of more complicated and easier at the same time), and plan ahead. Just like any other plane.
I'll also add that I personally find 22 very easy to land. Easier than 172 or anything else I have flown that does not have OLEO struts which is admittedly not that much.