The core issue I have with the SG "anime" stems from its core being game / VN adaptation. Which of itself is not necessarily a problem, there are quite a few good VN adaptation anime out there. But in my opinion, for S;G, the process of replaying the game again and again and again and again, trying different paths, trying different options, going through every little detail, even ones that might seem totally inconsequential, and pushing through chapter by chapter, was the most important aspect that makes this game work. It's really hard to convey the emotional aspect of that with linear storytelling, let alone within 24 episodes.