Cassiopeia feels weak

I am a main Cassiopeia and I have tested her quite a lot lately, I find it pretty upsetting that I get better games and plays with other champs that I dont play that much nor master at all like Taliyah or Lissandra than with Cassiopeia. Her damage output is too unreliable/short range/ needs time to rack up (landing several Es) and if you manage to do everything perfect, the damage is not that satisfying, like simply and spamming Taliyah's Q, I dont think Taliyah is op at all, Im just making some comparisons in order to proof (or at least try) that Cassio feels very underwhelming. None of the new runes seem to go very well with her, Phase Rush would be the one to go, but it is just a worst version of Stormraider's surge. I know it is too soon to judge, but her winrate has decayed in these few days, plus, other mages and assasins that usually counter her have been increasing in playability and winrate like Xerath, Zed...

I think this is just a snowball that was innevitably gonna end up in this really bad cassio state. First her E nerfs, probably the only reason she was picked in Worlds was because her lvl 1s cheese with corrupting potion, I find it totally ok since it was really unfun even to me. However it has just been nerf after nerf, the rylai's nerf was wayyyy too hard, they nerfed every single thing that Rylais gives. Then the introduction to Adaptive Helmet, it really counters cass hard and you just feel that you are just wasting mana doing no damage, and since you cannot have that easy boot MP, well, you are kind screwed until you have enough gold to buy a void staff and Liandries, and by then, the game is over since they feel very snowbally and quick lately.

Now lets look what Cassiopeia is supposed to do, Riot always describes her as the AP version of an ADC, except she is really short range with no mobility and has to land a Q and even then, an adc would probably destroy you if you match your E against their AA. Teemo seems like a better option if you want an AP adc. Cassiopeia is also supposed to be some sort of a kite mage, landing Qs, getting MS, zoning with W... But this pattern of play offers too little damage and little utility to your team (unless you put your W on an already CCed enemy), if you want a kite/control mage, Orianna, Taliyah or Ahri definitely outclass Cassiopeia by far. She also does not have burst, she is all about that dps and if you think about it, burst if wayy better thant a DoT, how do you want that 500 damage? done in 1sec or in 3 seconds? if Cassiopeia is going to be a dot dps mage, she should have more damage to compensate that. For last her ultimate, I love the idea, however, good in paper, not that good in game, the damage is punny, really buggy and the cone is awkward, plus the cast time, if they turn around you just slow them. I think a nice change taking in consideration how unreliable it can be and how strong petrifying gaze should be is that if you manage to stun them, the stun should ignore any tenacity, it should always do the 2sec stun. Sometimes I feel my ult is my only weapon against many divers, but then they have mercury and that new tenacity rune and it feels sooo damn weak, that ult that takes some skill to land and is so easily avoidable gives no reward whatsoever if you land it, I really dont think it would make her broken at all, it woukd just help her against diver assasins and tanks that already make her life hard.

This is not a "Cassiopeia is unplayable" type of post, but more like Cassiopeia could need a little help. I hope riot taked Cassiopeia into consideration when they do the Seasons patch.