Has it? I've encountered many Pokémon with green rings/low CP that have been painful to catch and it's still noticeable. I guess it's possible that my being around level 18 at the time of this problem (now lv. 20) could mean that catching just naturally became harder and mixed in with the bug so it could be taking me time to get used to it if it's now been fixed.
It really starts picking up at lvl 20+.
The low-CP pokemon are easy to catch, but they still have a chance to escape, but its a low chance, so you just throw a normal ball, no berry, and it usually works. There still is a chance of an escape, and it can also happen two times in a row, its just rare.
The ones that really screw you, sometimes out of 10+ balls, are the ones that look low and easy but that actually are not, the 350+ pidgeys and the 200+ weedles and 330+ rattata. Those look deceptively easy but the CP is actually high and they will be rather huge if you evolve them.
With these, you can either just skip them, or go for berry + hyperball and expect resistance.
You can just try to manage it, by knowing when to expect plenty of resistance, and then either skipping them or trying berry + superball.
In the low levels its basically easy mode, and at level 20+ you start leaving easy mode and some of the pokemon (you still get low ones) will get increasingly feisty. But then, at higher levels, you can also come across that 800+ CP Eevee that will evolve into something truly powerful, or a 1450 Magmar.
Its about knowing when it will be easy and when it will be tough, and then you need to decide: Use 1 or 2 berries and 1 or 2 hyperballs, or just skip it, or waste 10+ regular balls only to have it run away.
Everyone notices that increase in difficulty, learning how to deal with it is part of the game. The most difficult ones have an 8-9% chance to run away and only a 16-18% capture rate with normal balls, these odds mean that you can lose a whole lot of balls and then have them run away anyway, for good chances to get them, you really need berry + hyperball + curveball + nice throws, to increase your really bad chances of success.