I think mythbusters found that without assistance your chances are not good. If you can figure out the radio and get talked through the landing you should be able to do it.
Considering the probable scenario of not doing anything is a crash, you wouldn't make the situation any worse by having a go.
Putting aside the nature of Mythbusters (viz. the same nature of Wikipedia), I think from the blurb it really is not a good chance of landing an aircraft as a civilian.
The first struggle, as everyone has alluded to, is to find out a way to communicate with someone else. Fail to do that and you're done for. Press the wrong button and you're done for.
Once communication is up, you'd better hope whoever listens to you proactively does something (e.g. pinpoint your position, clear the airspace so you don't run into something, or tell you to move so you definitely don't run into something!) before they get someone quicksmart to tell you how to fly the aircraft.
The end statement of the blurb of the Mythbusters episode says:
However, even though the test was a success, the pilot pointed out that most modern planes are so advanced that their autopilot systems can literally land the plane by themselves, negating the need for a civilian pilot.
I don't know what
jb747 has to say about this, but I have my doubts as to whether that can be taken as is. For a pilot it may seem "literally", though this statement also mentions nothing about everything else besides landing (and there's more of that to be done before you actually land,
let alone if you do not land at your anticipated destination).
Also, if the course is changed for whatever reason (emergency, terrorist action, etc.) then your autopilot system is useless on its original course.
You probably can't do worse by having a go. You were going to die otherwise anyway, right?