The GTA 4 story is "really dark" because Rockstar's co-founder was "single and miserable" while making it: "We constantly thought we may be shut down"

GTA 4 is a noticeably darker and more dour game than anything the series had put out before or since, but a lot of that stemmed from Dan Houser's life at the time.
Sportskeeda

5 major downgrades that GTA 4 had compared to GTA San Andreas

When compared to GTA San Andreas, GTA 4 seems to be missing quite a few features, even though it was released as a successor. GTA 4 was a revolutionary title, but Rockstar had to sacrifice a lot to ...
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GTA 5 vs GTA 4 vs GTA San Andreas

gta San Andreas vs gta iv vs gta V System: Windows 10 Pro Intel i7 9700k 5.0Ghz Asus rog Strix Z390-F Gaming GeForce rtx 2080 ...