So, was this really a nerf? I think honestly he might be stronger now than he was with the changes they made. His dash IS a longer CD for mobility standards, thats for sure. Max CDR rank 5 is 7.2 seconds I believe, which is eh, I'll give to that. But the COMBAT power of the ability got a HUGE buff. His all in potential is soooooo much higher now, since you could:
1. Dive into the fight at any time without fear of split dmg, so skill cap is lowered and the overall lane presence of Gragas is stronger now.
2. HALF CD when he hits something. HALF. Im sure the CD before with max CDR was about 4.5 seconds. Now its 3.5-3.6 (cant be arsed for the exact numbers for a .1-.2 swing in cd). The slow lasts 2.5 seconds. That means with max cdr, rank 5, you WILL not escape him without a dash skill / flash. Also the half cd condition means more slams in a prolonged fight, so a buff vs more tanky targets yes?
I'd like to hear your thoughts and opinions on this nerf.
TL;DR
The "nerf" to the dash has given Gragas MORE power, making him MORE of a lane dominance champ, and the CD vs roaming isnt that damaging in comparasin to the dmg buff it now provides.