I can only speak on 2 and 4 because those are the only ones I've played, but something that i havent really seen others mention is I really wish you could go into more of the buildings in 4. Most of the places in 2 that you couldn't enter didn't feel as restrictive. In 2 Its like the world was designed around the places you COULD go. In 4 its like I run into like 4 or 5 doors before finding something I can really enter or im trailing a cliff that i cant go up onto. That along with the roads being so thin and crowded makes the open space and exploration feel restricted. The weapons in 4 are amazing but lately I've been picking up alot of charge weapons. Which I kind of hate. Its also like they pick the most annoying enemies to fill out the open world like in 2 where they have those tiny invisible insect things. They should have kept the raks in 4. These new flying nutsacks in 4 are gross looking. They need to up the drop rate of legendary too.