Ok so seeing as everyone else is making lists I guess I will too.  This list is of really stupid people.  Not people who are stupid because you disagree with them or really don't give a stuff about how they play but people who are in all likelyhood mentally handicaped.  Being bad at myth does however bring out many of the features of mental retardation.  Features such as repeating a simple same task 10 times but not understanding what to do the 11th time.

1.  Babyshaker   ~deer~
Something is seriously wrong with this guy.  His day seems to consist of waking up, logging on and starting a game of "Landing at White Falls".  He then proceeds to play it again and again and again.  

You can join and play with him if you like, he doesn't care.  You can do whatever you like in his game and he still wont care.  You can blow his units up 10 games in a row and he wont say a thing.  

If you are really lucky you might be able to get a "shizzle my nizzle" or
a "yo" out of him.  But this only happens about once a week .

2.  Father Xmas
First of all this guy is bad at myth, really bad.  When we played against one of the stronger NFD varients a few years ago our strategy was "attack father xmas, he'll die".  There isn't a team this year that would benefit from having him play, not even gypo.  Just being bad at myth does not warrant being on this list however.  He is also very thick.  He knows all the units and what they do.  He just doesn't seem to make the connection between what they do and how they can harm him.  The same goes for gametypes.

3. Se7en
There is a reason that Acheron and co called this guy "Idiot se7en"  Because frankly he is, pretty much for the same reasons as father xmas is.

4. Lebukin
need I say anything?

5. Beaver
I was hosting an ffa game once and beaver came in and asked to play grave lmoth.  The conversation went something like this:

Beaver: lets play grave lmoth
Me: ok
<<<<<<next game>>>>>
Beaver: lets play it again
Me: no, we just played grave lmoth
Beaver: ok, how about grave bc
Me: no, no grave.
Beaver: ok I'm hosting!
Everyone Else: sweet, a non-Australian host, lets go.
<<<everyone leaves to play in Beaver's host.>>>>>
<<<after 5 games of grave lmoth>>>>
Everyone Else: change the game, grave lmoth is getting boring
Beaver: ok, grave bc it is.
Everyone Else: ...
<<<New Host>>>
Beaver:  C'mon, lets play grave lmoth.
Everyone Else: No thanks.
Beaver: ok guys, I'm hosting grave lmoth, wanna join?
Everyone Else: No, we don't want to play grave lmoth, or grave bc
Beaver: How about grave captures then?

6. Urzooked
This guy is fairly similar to Beaver in his map choices, just replace grave lmoth with gimble ctf (if you're paired with URzooked it's gimble hunting).  He also hosts on a 33k modem in the middle of nowhere.  Countless of people have told him his host lags.  His reponse is normally something along the lines of: "I turn the graphics to Low Res so it can't lag" (yes he still does play on a pentium I)

7.  Bonky
Ever tried talking to this guy? have a go and you'll soon see why he's on this list.

8. Toecutter
A slightly less retarded form of father xmas and se7en.  He is still slightly mentally retarded though.

9. Jahral
See the description for beaver.  He also takes the trow. A lot.  And dies.

10. Malseziure
Same reason as jahral.

Honourable mentions:

Ten    ~Crows~  I think this guy has a language barrier so it's kinda ok.

Limp wanted me to add renwood and tank clank to the list as well but I don't agree with him.