Not exactly.
There's one contingent of people who say, completely incorrectly, that destruction mages cannot exist without zeroing out their magicka cost or relying on spamlock to freeze their targets.
There's another contingent of people who say, arguably, that destruction does less damage than the other ways to kill things.
The second group of people could be right. There's all sorts of arguments people make and throw around and whatever. But the first group of people are definitely wrong. And frankly, I don't care whether or not the second group are right. Because as a mage who relies primarily upon destruction, I get along just fine. And if you guys can make your uber sneak orc that can frenzy and backstab for 4,800 points of health, good on you. If you think that's what makes the game enjoyable for you, then have at it. But this isn't a dike-measuring contest. It doesn't matter if you can go do 4,000 or 40,000 or 400,000. Destruction is still viable. And it's not made non-viable by some other guy 1-shotting mammoths on Master. It still works for me. And for me, that's all that really matters.
The thing is, the same differences apply in lower levels. A low level 1-h still does 5-10x the damage a low level destro - the difference however is that at low levels 1-h does 5-10 times the DPS, not the DPH (due to mage constantly running out of mana). And at that time it the difference between clearing a room in a few seconds or in a couple minutes, and not simply pointles comparison of if you can take 2, 5 or 10 times the max health of an enemy in one hit...
Destruction was never non-viable, it is as viable as the other 3 + 1 damage skills. After all, as long as it can do
some damage, anything is a viable offensive skill. But it is much, much, MUCH slower. It's not any more or less exciting, any more or less challenging or any more or less useful - it is just slower. If in a supposed future zombie invasion, between a tazer, a chainsaw, a shotgun and a pen you choose the pen as weapon because you feel it's more satisfying to kill zombies with it, then sure by all means go for it. But you can't deny that it is inferior to the rest of the weapons, and in a real situation no sane person would choose it over a real weapon.