Of all the blowjobs ive had ...the best ones always come from guys so they were all happy with what is going on. We know ho2 to suck a dick better but ladies probably know how to eat pussy better.
For a heterosexual guy like me the convenient aspect of gloryholes is that, since you don't know who is doing the blowing on the other side, yet doesn't matter. Several times I have thrusted my dick into gloryholes to be serviced.