Animal Crossing has more gameplay then Acts 3, 4, and five of MGS4. Acts 1 and 2 were basically the bulk of what you could do. It's like Kojima stopped caring after Act 3. Not to mention that horrible reference to Madner in the act 3 briefing, which was suppose to be a reference to Snatcher, but god knows that MGS fanboys don't give two shits about Kojima's works outside of Metal Gear.
The series basically went downhill with MGS3. MGS2 was great, you could play more of that game then MGS4. (Hated Snake's acclerated aging plot twist, considering the MGS4 ending... which sucked massively but I might get into it later... maybe.)