While it may not be much better than GRAW it does improve in several key areas. Hopefully GRAW 3 will get it right.
The Ai is better but its still not good enough. While your squaddies don't block your line of fire nearly at all any more they are frustratingly inept at realizing when they are taking fire, or remaining stealthy, especially around corners. I often am forced to scout far ahead before allowing them to follow me. They are quite accurate as a defensive firing squad though, and they do respond to new commands quite well (they can shoot down helicopters and destroy land vehicles now).
Using Mexican gun emplacements is great in a defensive situation which is rather limited for the ghosts. As for the weapons the Mexicans drop, you'll probably never run out of ammo, but its nice to have them.
Multiple insertion routes are not really very useful and often not present in many missions. They seem like a token feature in most missions.
The game does include a huge arsenal of weapons, however unlike in graw, the interface for attachments is really awful. In graw you could see how the attachments changed the in game stats of your weapon and could better guage how to outfit your men and self. Its an unfortunate and unnecessary tradeoff.
I hope GRAW 3 finally gets it right by keeping and improving these features, and adding to it.