Clint_L
Legend
That battle is one of the reasons that I think counterspell is fantastic! I don't know if you are remembering it accurately:From the powergamer perspective, counterspell is great. If a few people in the party have it and use it every round, you can just stop the DM from ever using casters. For anyone who thinks it's just fine, just watch the climactic final battle of the first season of Critical Role.
I feel like people who think it's fine either don't face enemies with spellcasting that often, so i doesn't get used much, or they purposefully hold off on using to shut down enemies in order to play nice with the DM.
Vecna pushes the party right to the edge, and when they finally win, it is not because of counterspell; it is because all of them contribute and wear him down; if anything, Pike Trickfoot's mass heal turns the battle. Counterspell, cast at level 9, stops Vecna from escaping, not winning, and there is a monumental cost to using it: it consumes the spell slot that was being set aside for a wish needed to save Vax'ildan, so casting that counterspell doomed a character.
I feel like people who think it is a problem maybe tend to put too many eggs in one basket. It's one of my favourite spells in the game, and I'm normally the DM. I love it when players take counterspell.