User blog comment:Crazy sam10/My views on a MW4/@comment-4676581-20130225135810/@comment-78.97.91.207-20130225185343

There are some pretty big differences between the two. First of, the IW engine does render a lot more detail, but the map size is very limited (especially because they want to maintain those pesky FPS). If CoD wants to continue to portray large war scenes where it doesn't feel like the battle is just in the background and you are fighting in tight alleyways, they need to upgrade. Secondly, It's either the dev teams or the engine that seems like they can't handle decent artificial intelligence. Just compare HL with any of the modern CoD games...you can't. The Source engine is superior in a many ways.