So, by having one "good" (debatable) sp game in their entire catalog you already consider Treyarch "single player experts"?
It, to me, is perely subjective. Maybe you've played more games than I have and that is the reason behind this.
I, for one, liked it because it gave me a good 5-6 hours of fun.
Treyarch is expert when compared to DICE. put it this way, shall we?