Concerns about Nasus
http://img3.wikia.nocookie.net/__cb20131121041736/leagueoflegends/images/thumb/3/38/Nasus_OriginalLoading.jpg/110px-Nasus_OriginalLoading.jpg **Pros: 10 / 15 / 20% life steal passive http://img4.wikia.nocookie.net/__cb20140115131224/leagueoflegends/images/9/9e/Siphoning_Strike.png Infinite Damage 20 Mana - Extremely Tanky Can go full tank and has the potential to deal the most damage in the game Massive slow and attack speed debuff for 5 seconds - http://img1.wikia.nocookie.net/__cb20140115131146/leagueoflegends/images/a/aa/Wither.png AOE Armour penetration - http://img2.wikia.nocookie.net/__cb20140115131242/leagueoflegends/images/9/9b/Spirit_Fire.png AOE Ultimate which deals % of max health along with giving a massive health boost. - http://img2.wikia.nocookie.net/__cb20140115131242/leagueoflegends/images/9/9b/Spirit_Fire.png TOTAL MAGIC DAMAGE: 45 / 60 / 75% (+ 15% per 100 AP) of enemies' maximum health - http://img2.wikia.nocookie.net/__cb20140115131242/leagueoflegends/images/9/9b/Spirit_Fire.png ** See the issue? As long as Nasus is allowed to stack which is actually very easy for him to do considering his q is basically manaless, he will become a powerhouse even if he goes 0/7 because all he needs are stacks and then just to build tanky. He can be poked to death in lane but no worries as long as you can Q well then you will be stronger than everyone else. Not to mention his attack speed de-buff is bullshit against AA Top laners like Aatrox, Xin Zhao, Tryndamere and many more, as well as every ADC in the game (except Kalista).
The major issue with him is when he get's kills in lane and farm, then he is able to 1 v 3 or even 1 v 5 and to prevent this from happening either the top laner must stay in lane all game to prevent him from farming, or the jungler has to camp top the entire game just to try and stop him from farming.
He's too strong for ELO'S below Platinum where everyone just allows him to get 420 stacks in 30 minutes and then proceed to wreck towers in 1 shot, he needs some sort of nerf..
+
+ map awareness > jungle ganks. It's such a passive lane that you should be checking your map consistently. Really, you should be in any lane, but playing in this one gives you more than enough time and wiggle room to do as you please here. You can play smart, or you can let him be passive and play into it.
