Computer/ Engine Strength?

I recently played against the chess.com "expert" level computer, which was supposed to be rated at least 2000 by the site's standards. I seriously doubt that it was that strong. It appeared to play by discernable principles, but its calculations were very dubious. Has anyone else encountered this? Was this a fluke? Because the computer did not play well. If this is the same engine provided to basic members for analysis, is there any point to the basic member engine analysis provided here?