Yes they were, just not as long as some of them are in MGS4. If you play MGS4 without being a fan of the series or know what you're getting into, then you're going to be hugely let down. I can see where people are coming from though, MGS4 doesn't have enough gameplay compared to cut scenes but I wouldn't have it any other way.
MGS4 is the type of game you play when you have no interruptions or distractions, it requries your full attention to enjoy it. Its just not a game everyone can get into.
I played MGS1,MGS2,MGS3 & then MGS4 all back to back and after all that Metal Gear, it was nice to play a game like Mario Galaxy or God of War that was just straight up gameplay.