Game balancing of champions

So, I was wondering how everyone felt their "main champions" have been balanced since season 4. The reason I ask is because I find I no longer really have a main. I've been floating from champion to champion for quite awhile. My mains have all been either net nerfed, changed dramatically, or even just been nerfed due to mobility creep, itemization changes or even just not had their balance upkept. Just a few of those champions were . I even used to main .

Does anyone else feel like picking what used to be their mains just isn't always the right choice? Anymore I feel like I should just pick what the balance team decides should be strong for the next two weeks. I feel like I should just start playing all of the fotm champions just because they are a little easier to tank, or deal damage with, or whatever they are doing better than what the champions I used to play do.

On the flip side, I've started having more fun with , because to me right now they feel stronger than any of my old mains.