I need to clarify my previous statement. The MK-III does have many good new features that I like--a nicely contoured ejection port and the mag release.
Yeah, I don't care for the LCI and mag disconnect. But good news is the LCI can be removed if function problems cannot be eradicated. The mag disconnect can also be removed later on if the user finds that this feature makes disassembly more difficult. Yes, it's a little more hassle for the new MK-III owner, but Ruger still makes a good gun. Now, if the MK-III owner has no reliability issues with his gun, then that would be a bonus.
Personally, I wouldn't let these feature keep me from buying a MK-III if this will be my first 22LR. However, I would definitely install a VQ extractor and ditch the LCI at the outset.