Today I'd like to bring up Gangplank. Kind of controversial champion who had his hossas and bessas leaving him nearly forgotten in Season 3 - which in my humble opinion is pretty weird as his itemization got hella improved.
Now you are probably asking - why would I pick Jungle Gangplank in season 3?
Gangplank's itemization is one of the most versatile in the game. Your synergies with items are endless. You can itemize in few different ways and still be effective during the course of whole game. Currently I consider these paths to be mostly used
Supportplank: items like Aegis/Solari/Zeke coupled with Iceborne Gauntlet to add up some decent damage and kiting power.
Bruiserplank: Frozen Mallet/Warmog's Armor/Atma's Impaler. Huge health, powerfull slow on Parrley, great sustained damage output.
Carryplank: Trinity Force and Infinity Edge. Because everyone loves melting faces with those 1k damage Parrleys.
Additionaly there are some items which are always amazing on Gangplank due to huge synergies with his skillset overall. Avarice Blade, Spirit of Lizard Elder or Phage are all powerfull pickups for Gangplank.
What's the most important thing? You don't actually need to pick any of these builds at the start of game. "Humm, I managed to snowball pretty hard? I'll grab that early Triforce", "this game my carries are capable of carrying me? Better pick up aura-items to support them."
It makes Gangplank safe champion. Whenever I play someone like Nocturne it's either nut-up or shut-up. Transitioning into mid-late game as 1/2/1 Nocturne is horrible experience. Gangplank lives in this enviroment without slightest issues.
Gangplank's farming capability in the new jungle is unmatched. Hey, don't be confused. Obviously his clear isn't that fast - but amount of gold he picks up in the new jungle while staying on decent speed is his huge advantage. Parrley's passive granting up to +8 gold per minion kill is impressive, especially if you will consider that small Wrath gives you 4 gold bounty. You can stick to farming your jungle like there's no tomorrow and pick up much more gold than other junglers can do.
Let's compare situation. You need 4 seconds to clear the camp while last-hitting 3 wraiths out of 4 with Parrley + Avarice Blade. Your opponent needs 2 seconds to finish this camp.
50 gold from large Wraith + 12 gold from small Wraiths.
50 gold from large Wraith + 12 gold from small Wraiths + 30 gold from Parrley last-hits.
62 gold vs 92 gold on smallest and most popular jungle camp. Yes, things like that slowly add-up to your lategame.
Gangplank is currently the only champion with not-nerfed-into-oblivion and truly global skill. Global-based champions such as Shen have their very special place in heart of players just due to amount of map pressure they can put from any place. Obviously Shen's ultimate is far superior to Gangplank's with two small things:
* Shen is pretty often banned/counterpicked
* Shen's ultimate cooldown is ridicolously huge
Having access to global-range AoE slow + damage might be less impressive, but that's a good mechanism allowing you to focus on farming AND being able to react to what happens on the map.