lol, top lane needs ganks the most because it's the most vulnerable to them XD bottom lane depends upon who is overextended, who is the most fed, and who plays better. Mid is "don't come here, you'll die!" or "why in the world did you walk right passed them! they're at *********(asterisks intended) 10% hp
oh, love those magical moments when your junger is within 1 camp of you and heading your direction, so you battle it out with their top, only to have the jungler never show because they either back from taking too much damage in the jungle or because they wanted to "help" bottom lane, meanwhile darius top or jayce top (overextended) just happily farm and break your turret in the next 5 minutes because of their free kill XD
jungle is the least mentionable lane at the moment because they're usually 2 levels behind due to the jungle being practically unkillable unless you use a specialized champ (like say nunu)
lol, nunu will be like level 10 while everyone else is level 6, but at the same time his damage potential falls off so hard late game that it's really annoying