Having been here for quite a while (with the occasional break nonetheless), I can safely say I've seen many players start off that could be described as definite lolwuts with no grasp of roleplay beyond "pew pew!". Many of those that stuck it out are now some of the very best roleplayers here, while there are a few who ultimately haven't progressed much beyond simply staying out of trouble while still being the "pew pew!" guy they started out as (i'm looking at you Soul Reaper! j/k).
Ultimately though, patience and understanding is needed, no matter how angry/annoying/frustrating it will obviously make you at times. I'm not saying you're never going to get bloody annoyed etc, since it happens to everyone at some point, and you will always get players who simply never learn. But given enough time and patience and encouragement, you'll be glad you did help guide/encourage new players, and might make some cool friends in the process.
Besides, as other people have pointed out, we need all the new players we can get anyway, since this game is 10 years old next year XD