Let's talk passives
A passive is a very important part of a champion, it's the biggest thing about a champion in my opinion. Some passives are great, such as Lissandra's Iceborn and Syndra's Transcendence, but I think some passives could use some work. Such as Ashe's Focus. It is a pretty good tool for farming early game, but late game it doesn't seem to have much use. The cooldown is extremely long on it and only coolsdown when you are not attacking something. Maybe something could be done about it to make it where the cooldown goes on while she is attacking, or maybe she gains 2% crit chance with each level? (kinda like Trist's passive)
Another one is Morgana's spell vamp, it's not a bad passive but it's really not that strong. I play Morg often in mid lane and when I'm against high poke champs like Kat or Ziggs then I often have problems with health, even with Rod of Ages I still have a problem. I just think that her passive could use a slight buff (also maybe a slight nerf on dark binding >.>)
Some passives also seem kinda....lame. Such as Shyvana's. Shyv is one of my absolute favorite champions, she's really my only good top laner and I think there is a lot of potential for her to have a great dragon-like passive.
Anywho, this is just my take and opinions on a few passives.