Hardly. What you see here in the forums is any number of longtime members, such as Yours Truly, who have used AS for a long period of time, because we believe in it. (AS has won 909 auctions for me, over a nearly three-year period.) There are far more posts here, even from new users, praising AS as a product and service, than complaints. Of course there are occasional problems, but with thousands of snipes going in every day, AS seems to be doing a great job at it. That is why we have so many regular posters in here, who represent but a small fraction of the AS users' community, most of whom never come in here.
As for the purported problem, if it were I with the problem, I would refrain from comment until I had checked with the seller, to see if my name had been blocked, intentionally or otherwise, because the error message in question indicates that the transaction was blocked from the seller's end. And the post does not not need to be placed in two separate threads; one suffices.