The reason Lee Sin and Udyr are stupid amounts of broken is
1.Their safety from level 1. Lee Sin and Udyr can start with any combination, Doran's Blade even, and still clear jungles with relative ease. Both have passives that lead to great sustain and shields.
2.They both can start at Red and gank top and force a flash if not a kill.
3.They both can build to be WHATEVER their team needs. Need a tanky DPS? Got it. Need a straight unkillable tank? Got it. Need an Anti-Carry to just dive that rampaging Vayne? Got it.
4.They both can dive turrets at a very early level. Udyr comes out with Red Buff, stuns you, then just Phoenix+Red Buffs you to death. Then his stun comes back up and it's like....FFFFFFFFFFFUUU. Lee Sin is even worse because he can dive and then just LOL W back to allies.
The only thing keeping Skarner from being like them is his 1-5. Once he has enough mana to spam Q he becomes impossible to escape thanks to chain slow and speed buff. His Ultimate is the MOST mistake punsihing ultimate in the entire game. You get grabbed out of position and you're dead. Period.
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Realo won gold at the Sex Olympics with a BROKEN FRIGGIN NECK.-Voltch