People keep saying that "good mages will find a way" or "it will separate good mages from bad mages". No. It will separate totally braindead opposing teams from bad ones, in that shit teams will get bursted with the most easily countered damage in the game, and remotely competent teams won't ever take significant damage from Mages.
One thing that people don't seem to comprehend is that it has totally turned our burst sequence around: we used to bomb -> deep -> do shit tons of damage for 4 seconds, then do a little bit of trailing damage usually in an imp CS. Now, we have to bomb, imp CS, blow all our trinkets, do a little bit of damage via pet freeze shatter, and FoF procs, THEN deep, THEN have the bomb explode on its own. But the only way for this to be game-ending burst is to blow your trinket+icy veins as soon as the imp CS lands. This means the other team has 6 full seconds before the majority of the damage comes - and it's known beforehand whether or not it is serious pressure or not. On live right now, you can take bombs every 8 seconds or so, but you don't know exactly which one is going to be a bomb deep trinket orb until you're already stunned and the bomb explodes.
It was obviously too much damage... but it's so ridiculously counterable now that Mages will simply not be a threat in serious arenas or RBGs anymore.