Reign of Gaming

From my experience a good shaco or lee sin tend to wreck havoc no matter what the rest of their team does and this much earlier than the other junglers mentioned here - breaking the morale early tends to win many games. They cannot guarantee kills, but most enemy junglers will be extremly careful around them. Even without flash they have everything in their kit they need to engage or to run away if outnumbered, allowing them to take more offensive summoner spells and increasing their chances of early kills even further. On top of all that they can avoid typical ward positions - checking the first items of the enemy player items usually tells you if they have bought wards and if they placed those already. The ward placement tends to be somewhat predictable, which all works in your favour.

They usually keep the kills rather than feeding their lanes and the assumption that the rest of the team will 'fail' might not a positive starting point in the first place, but that's a different issue.

Imho shaco is very potent due to his early pressure and it's often all about breaking the morale early - against some junglers you have pretty high chances of ganking them in their own jungle. Mid usually don't put wards down and buy little health regen (e.g. even the small ganks that only apply a few hits are very effective) and bot and top rarely expect in lane ganks and only ward the classic bushes. With q you can easily enter the lane bushes undeteced .. wait for the cooldowns to reset and you have really high chances to get a kill. Besides shaco doesn't need flash and can take exhaust or ignite which makes his early ganks even better. Mid to late game get a bunch of wards and pick out single players in the enemy jungle.

I'd say Kassadin, Twisted Fate, Pantheon or Nidalee are among the best in a realistic scenario. That there are champions with a better waveclear and stronger damage on the towers / inhibitor / nexus - there is little doubt about that, but TS or Panth can directly port to an opportune lane and Nidalee or Kassadin can easily avoid typical ward points and still move very quickly across the map. If the enemy team doesn't ward to notice such attempts / you clear their vision or can't react to split pushing, that's something else again. Kassadins Netherblade Active will actually make it 70% AP damage to towers with his basic attacks and with AP being cheaper than AD he will almost rival AD champs in tower damage.

On a more silly note - Veigar with too much time for obvious reasons. He can one-hit towers at some point since 40% AP is added to the hero damage on towers.

One thing that hasn't been considered is the fact that last hitting with a damage item is easier - in particular in the early levels. Besides usually on your first return anyone starting with a longsword will have an advantage at his first return to the shop since it upgrades nicely.

I don't think that he is a good adc carry - mainly as mentioned above, if built as a proper adc he cannot make much use of his hammer stance abilities being too squichy and his AA range for teamfights will get him into bad positions easily. However he can be a real problem for any opposing adc that cannot clear minion waves quickly if you have Soraka with you to keep you at full mana. You can force them to farm under their tower at a very safe range and at least in Silver 1-3 elo many adcs have problems farming under their tower if they have to deal with a fair amount of poke on top of that.

If you menage to keep the enemy adc at a low cs and force early teamfights or avoid them alltogether and rather splitpush / poke he can work imho.

From my experience the best all around support is Lulu - she can't do miracles and win a lane against a well playing team of adc/sup if your adc is really bad/ you and your adc don't play together, but I don't think such support exists - some players go with a support like Lux, Nid etc. that effectively is a carry and itemize / rune even accordingly and start taking creeps if their adc doesn't do well in their opinion, forget about wards (since they want the damage items), but that backfires most of the time or at least results in a very toxic team play.

As mentioned above in some posts, she is very flexible and has 5 abilities + ulti. She is good in helping to push lanes, very strong poke, with shields can negate the larger part of most damage abilities from the enemy support / adc, has sufficient cc + speed boost that can save your adc from a gank or help your jungler turning the ganks into succesfull ones. Besides she remains useful even if she has very few items.

Some supports such as Blitz or Tresh can snowball harder if they really outplay their counterpart by a big margin, but most of the time the matchmaking system will avoid that. And as mentioned - supports such as Leona are require good teamwork with your adc.

I think a big advantage of lol is the huge number of players - personally a forced 'dungeon finder system with fixed roles' doesn't appeal to me since it enforces a certain meta. Admittingly it tends to work best for a group of random players, but I wouldn't like to exclude other options by default. But what would Riot stop to make it optional so that teams will be either made up of players who want that 'dungeon finder thingy' or those who prefer the 'extra freedom' - both types could still play against each other. Before entering a queue players can choose their preferred method.

Hoi :)