the broader context refers to something that originated on 4chan as "goyslop", consumerist media made for goys, a term made synonymous with "sheeple" (sheep + people). slop is something fed to swine, so the connection is that the consumers are herded cattle that accept whatever their overlords feed them. obviously, goy is a term used by jews to categorise non-jews as not jewish, linking the label of slop and goyslop to the common narrative of jews controlling media, etc;
most refined products will be soulless, because they are made to be generic, to be unobtrusive, to not go against the accepted norm. slop would then have to refer to something else, and among people who use the term as "goy"slop it has to mean something other than low-quality. it has to be very intrusive and coded in meaning.
technically speaking, San Andreas is not really a good game, it is just a mimicry of a trend that was popular the late 90s to mid 2000s about ghetto and black gangster culture. a generic bad cop narrative, gangsters are people, too, in a bizarre and meandering story that involves federal agents, a secret military prototype, helping out a chinese triad, etc; none of which have anything to do with "the hood" as the primary motif. and that is just the setting. its gameplay elements are curious. the game has a large map, but it only serves as filler, while the cities put together are as large as the urbans in the 3D games. the gunplay is bad, with a weak audio-visual fidelity.
i would not call it a slop game, certainly not goyslop, but it is not incorrect to think it is a soulless cashgrab, since ultimately it does not say anything about the state of the "urban community". it is no wonder that these games are set in fictional U.S. cities and not in an actual ones, they just copy and paste the landmarks or general feel to make you think you are in a place, doing something, but are not actually doing anything.