It is. But only in so far as the content and scope of the game far surpasses anything a smaller developer could ever hope to accomplish. You may prefer one over the other, totally fine, but objectively speaking you get way more out of gta 5 content and scope wise than bg3.
As others point out gta online is a dumpster fire but it’s still massive and allows you to do endless amounts of things, racing, heists, owning property, running businesses, etc.