What do some fans mean by "dream-like vibe" while comparing SH 2 OG to remake?

Like it's a genuine question. I'm always confused when I see comments like "SH2 lost its dream-like vibe in the remake." What are they referring to? What is that state? How do I feel it? 

Ps. I've played 1-4 SH games (completed too) in case anyone wondering