Kassadin desperately needs more health per level. Here's why..
So, I've noticed there have been quite a few base stat buffs to many champions while Kassadin, who is already nowadays weak, is left even further into the dust. Lets start with some reflecting for the past.
Kassadin was once known for being a crazy snowballing assassin that can fully nullify mages and permachase/slow his target for easy kills. Now, people may argue that these values of Kassadin are still alive today, which they somewhat are. The problem though is that after Kassadin was receiving nerf after nerf and left in a very weak spot, they changed the uses for how RoA works, being a mana/hp item more favoring mana/ap. Now, tis true that he can just a bit more damage with this item, but the real reason why Kass sits at a depressing 40% wr is the fact that RoA, a core Kass item provides not a lot of health now. Kassadin already has only 78 health per level. For his core item to be even further more not benefitting for his health, leaves him very very squishy... with still not that much damage at all considering his repeated nerfs that has relegated him to a slow bot.
Also, his riftwalk range has been hit quite hard not long ago. This makes it a whole lot harder for him to actually enter a fight and often suffers from damage taken before he even enters in. Once he actually gets in, you better pray you have a zhonyas or you'll explode instantly, only doing probably 600 mid/lategame damage to your opponents (which is extremely low)
My verdict is that with all of the recent changes lately, it has made Kassadin in a VERY awkward and VERY weak spot. I'm sure most of us has had our PTSD before of when he was OP, but he's so far gone now that some small durability buffs won't set him over the edge. I just dont like seeing all these base stat buffs on the PBE and Kassadin not be included. It's like kicking dust onto an already wounded dog.
Kassadin
Health per level increased to 87 from 78 Kassadin once again has MR per level 32.1 +1.25