It is still easier to play with something flying than not. However it is not a big problem, and the better you get, the less important flyers become. The update that helped a lot was that if you put one wound on them in melee, they are grounded for a round (usually to their death).
I run a Varangur list with no flyers, and I do extremely well with the list.
In my League of Rhordia lists however, I use 1-2 cheap flyers that I really don´t want to drop from the list, so the faction / type of list you play will also matter.
By playing no flyers, you get more points for other stuff, so use that advantage to your benefit.