Running through Metal Gear Solid 4 for the first time. Just finished Act 1. Its slow going since I'm trying for a no alerts / no kills run. Save points are way too far apart for my tastes. Tonight's endeavors ended after losing more than an hour in the first area of Act 2.
So far, I'm liking it significantly less than MGS3 or MGS:TTS, but all of the continuity porn has kept it above MGS2 thus far.