I'm just doing a quick fly by of your game focusing solely on you. I didn't look at what your allies were doing so I'm not going to compare you to them. I'm also going to focus mainly on mistakes, since its usually pretty obvious for people to realize where they did good but its not so obvious to realize where they did bad.
@4:10 - You were forced out of lane by Nid and just arrived back to lane. When you got forced out of lane Ori pushed your lane and denied you a lot of creeps. However, when you got back to lane you didn't push the wave and none of your creeps died to the tower. This allowed Oriana to maintain the early CS lead she got on you.
@4:50 - Very good reaction time to collapse on Nid in your blue side jungle, shows very good map awareness. However, you overextended a bit too much and allowed Ori to get some unnecessary harass on you (as well as completely depleting your mana.)
@5:00 - You are at 14 CS. That is an average of 2.8 CS per minute (not good.)
@5:35 - You move forward to get a CS when you didn't have the mana to trade with Ori and she punished you for it. This allows her to zone you away from your turret moments later, causing you to lose 6 CS to your tower (so you lose 6 cs to gain 1 cs, not a good deal.) When you are low mana you need to play more passively and focus on CSing under turret.
@6:35 - You return to lane and Ori is out of mana. As you kill the last of the wave you should have thrown out your stun and tried to get Ori to draw turret aggro. She wouldn't have been able to trade with you since she didn't have any mana.
@7:20 - Lee moves to all in Nid and you are slow to help him. Its definitely not all your fault, Lee was way too aggressive and didn't give you much of a chance to help him. You chasing Nid and taking a few spears to the face causes you to have to burn flash (using flash was a good decision though.)
@7:55 - The harassment from Nid forces you out of lane yet again. This allows Oriana to push the tower hard, causing 11 more minions to die to your tower before you can get back. You having to back so often is resulting in a significant experience and gold advantage for Oriana.
@8:38 - As Lee moves to gank your lane you aren't in any position to land your stun or assist in the gank.
@10:00 - You are at 23 CS. That is an average of 2.3 CS per minute overall and an average of 1.8 CS per minute in the last 5 minutes
@10:10 - Smart decision to use your ult on Oriana. If you hit with all 3 you would have gotten a kill. You handled the tower dive from Nid very well.
@12:45 - You stay for too long trying to assist killing the dragon. Once you go OOM you should back so Oriana doesn't push the wave into your tower again. Your late back allows Oriana to destroy your outer mid tower.
@15:00 - You are at 40 CS. That is an average of 2.7 CS per minute overall and an average of 3.4 CS per minute in the last 5 minutes.
@18:20 - Good engage onto Thresh with Lee to get the kill. However, you don't pay attention to Oriana rotating even though she gets spotted by wards and your team pings danger several times.
@20:00 - You are at 52 CS. That is an average of 2.6 CS per minute overall and an average of 2.4 CS per minute in the last 5 minutes.
@20:30 - Lee and Leona are rotating to help you with Nid but you are way too far back to help them, allowing Nid to escape.
@22:05 - Oriana has double your CS, 124 to 62.
TL;DR
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Your CS numbers HAVE to improve. You're goal should be 7 CS per minute. Your low CS numbers made it so that you were not very dangerous in the early team fights. You didn't die in them but you also were putting out a lot less damage than Oriana. This, along with mistakes from your teammates, allowed the other team to get a sizable lead in the mid game.
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You seem to have a lot of problems last hitting under tower. Here are 2 videos that I made that discuss CSing under tower.
https://www.youtube.com/watch?v=upDMcjQur3w
https://www.youtube.com/watch?v=31FtxSBAyM0
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You got forced out of lane a lot because of your inability to dodge skill shots. Try to practice being less predictable with your movements or practice dodging in custom games. Sometimes its better to buy a few extra potions rather than miss out on a whole wave of CS while you back and return to lane.
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Your team fighting is probably what you are best at. If you can improve your CS numbers you will start dominating team fights.
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You have a tendency to chase into areas where you don't have vision (your whole team suffered from this problem.) Don't be afraid to buy some wards and don't forget to upgrade your trinket after level 9!
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Objectives are more important than kills. Never give up an objective for a kill (i.e. don't chase an enemy through their jungle when you can take a tower or dragon.) Towers give your team 750, 850 or 875 gold (for outer, inner and inhib respectively) which is way more than you normally get for a kill.
This is the kind of analysis I try to do for all my games, except I cover each lane in more detail. Hope this helps.
