I notice when I am playing normal draft and even when I am playing on a premade 5 man team that the majority of the teams I am on or against don't even fill all the required elements of a team, so I decided to break down what makes a team and hopefully get some input back on what I am missing.
Official team positions
Jungler- jungles allowing for greater overall experience gain and buff/crest/dragon control also provides ganks
Ad carry-provides collosal late game damage to push towers and win teamfights
Ap carry- generally high damage nukes, aoes and cc
Tank- reduces damage potential of enemy team while absorbing the majority of enemy fire power and generally has good initiation potential
Assassin- kills high value targets like ad and ap carries quickly before they can hurt your team while having good escapes to hopefully survive the kill. Some assassins have decent initiation effects as well.
Support- allows you carry to farm the vast majority of minions while having abilities that either ensure your carry kills or ensures that your carry wont get killed.
Bruiser/tanky dps/melee fighter- have decent damage as well as decent defenses that allow them to survive initial assassin burst damage and kill the assassin before it can kill the carries and may also have good initiation abilities. Generally have poor escapes.
Now obviously that is 7 positions and you can only cram 5 people on to a team, but luckily most tanks, and assassins can do double duty.
For example lets say you have
Annie mid for your ap carry
Miss Fortune bot for your ad carry
Shyvana top for your bruiser
Now you have a problem in that you need an assassin a jungler a tank and a support all in 2 champions. Luckily there are such things as support tanks like shen, alistar, and taric. So we grab an alistar bot, but what are we gonna do about our assassin jungler.
This is actually easier than finding a support tank, because there are a lot of really good assassins who also happen to be very good junglers such as shaco, wukong, Lee sin, pantheon(if you are specced right), and Xin Xhao. So we grab Lee Sin.
Now our team looks like this
Miss fortune and Aistar bot
Lee sin in the jungle
and shyvana top
So our team fills the required roles, but is it a balanced team. To figure that out lets look at the specific things a team needs
2.A steady stream of ad damage
3.CC effects like slows, knock ups, stuns, fears etc.
4. Initiation abilities
5.A reliable form of ap burst damage
6.Damage reduction/damage soak
So lets compare that to the team we made
1.Aoe/Aura damage- Annie, miss fortune and Shyvana all have good aoe damage so we have that covered. We might have over done it actually, but too much aoe never hurt anyone that you didn't want hurt.
2.A steady stream of ad damage- Miss fortune as a ranged ad carry will provide that if she can get enough farm which is Miss Fortune's specialty
3.CC effects like slows, knock ups, stuns, fears etc.- Anne only has one stun and it can't be spammed, so she is kind of weak on cc as far as mages go, but fortunately alistar has plenty of knock back and knock ups to go around. Shyvana and Lee sin also have some limited knock back so we have plenty of cc as a whole.
4. Initiation abilities- Alistar probably has the best initiation abilities on the team, but shyvana and lee sin can provide limited initiation as well.
5.A reliable form of ap burst damage- Annie as the ap carry can provide this
6.Damage reduction/damage soak- Annie has a good shield, but the real damage reduction is gonna be alistars awesome 50% damage reduction ultimate which will hopefully allow him to tank everything the enemy team is gonna throw at him.
7.Ganking potential- Lee sin has great ganks so this probably won't be much of a problem. If we had chosen a jungler who didn't have such great ganks like prelevel 6 wukong and amumu Shyvana can provide great ganks as well from top if she takes teleport and exploits some wards her jungler layed down. Annie can always save up a tibbers stun and gank bot as well.
8. Lane sustain for the carry- In the team we built alistar's heal comboed with any lifesteal miss fortune builds is gonna be the sustain, but other types of sustain are possible Tryndamere and Kayle can actually sustain themselves using their abilities and an interesting form of sustain can be accomplished with Janna, Lux or Morgana where they simply continually shield the carry from damage in the laning phase so they don't have to go back as much. This type of sustain is good because after the laning phase it can still be useful by functioning as extra bubble wrap on your carry so that your carry can keep spewing damage and score your team those aces. Zilean can actually bring your carry back to life incase they accidently happen to die.
This team is good to go and is completely competitive. Now obviously I followed the meta for simplicities sake, but it is totally possible to say screw the meta and still build a competitive team. For example lets say we
Sent Caitlyn solo top
Sent Akali Mid
Sent Lux and Garen bottom
and had Amumu jungle
That team is just as competitive as the previous team and maybe even more since your opponents are now scratching their heads going "but the ad carry is supposed to be bottom and my sion isn't ranged"
Anyway if you guys have any good team combinations you want to share or think a competitive team needs something that I missed feel free to comment below. Together we can stop the fielding of crappy teams.