I'll be contrary to that, aeb.
QB is probably Tayschrenn's equal in most things, his better in some. The only edge Tay has on QB is displays of raw power in the early novels - QB has his own in later ones, and his sheer skill and intelligence would probably allow him to one-up Tay in most circumstances. I suppose I'd give Tay the edge in terms of power reserves, though. The man can just keep hurling magic forever, it seems, while Quick tends to tire much faster (then again, that's usually when he is channelling six or so warrens at the same time, a feat Tay probably can't even begin to compare with...though that may simply be choice, rather than limitations).
To focus purely on MoI, Quick controls the descent of half a mountain, using no doubt D'riss, a warren he has shown very little familiarity with in the past, and while this alone could be put down to his link to Hood's power through Talamandas, I very much doubt that is the case (given in RG he
) and we can see from Dust of Dreams
.
Now, to consider Tay taking on Rake in Gardens, there are several factors to take into account.
Rake was dealing with four High Mages and the mage cadre, and he outright stated that he didn't commit to the battle properly, instead trying to make the casualties too high for Tay to accept.
Tay was busy playing out his own plans against Nightchill, who of course was making a play for Dragnipur too.
Rake only needed to pull back in order to save Moon's Spawn. The implication is he wouldn't really have been that hard pressed if it was just him vs the mages, he just needed to defend his people's home too.
Plus you have the whole question of exactly how events DID go down in that scene, and that leaves many unresolved questions to this day.
Basically, though, I'd say read on, and decide more for yourself later in the series. Hell, I think it may even come down to the Crippled God for us to see what QB's really capable of.