My personal experience with what I own:
Beretta 92 and Star B Super, takedown is very similar. Turn the lever, pull the slide forward. As DanHend said, the Beretta requires pushing in the button on the right too.
Next level of difficulty- Hi Power and CZ 75. Have to line the slide up with the frame "just so" (usually there is a notch), then push the slide stop out. Still pretty simple, sometimes the slide stop is tight. Got a Star 30MI, same technique.
Tokarev- deceptively easy. Some people fight with the barrel bushing, but the easy way- slide the retaining clip back, hold the pistol so the left side of the frame faces down, then rack the slide. The slide stop falls out, then you just take it down from there. Since the hammer assembly is separate from the frame (you just lift it out/drop it in), it's probably the EASIEST to clean.
S&W semiautos- about the same as the CZ and Hi Power, with a few caveats. The hammer always strikes me in my thumb webbing as I remove the slide; not awful, but a little annoying. Perhaps it's the way I am holding it (it strikes my left hand), but that's the only way I can comfortably grip things to take it down.
Then, there are the various little pieces on the frame that you have to push back down as you put the slide back on. Seems like my 915 has more than my 39-2.
My 1911 can be a pain, since it wasn't the first gun I learned to take down and reassemble (reassembly is what gets me). All the other pistols with separate bushings, I reassemble the slide and barrel assembly first, then put the slide on the frame, and slide stop goes in last. I've found that with my 1911, it's easier to get everything lined up on the frame, put the slide stop in, and then put the bushing over the spring.
Blowbacks like the Makarov are very simple. Pull the trigger guard down, pull the slide back and lift off. I own 4 different styles of 9x18 East Bloc pistol, they all work this way.
Recently bought a Ruger Mk II 22lr, breaks down easily enough. Whoever designed the reassembly must have been a sadist.