Well, now that you mention it. My take on this is pretty subjective because I am not a native english speaker. While I watch a lot of english-movies these days, I was brought up with a rich world of overdubbed movies in my native language. These overdubs tend to have a very good quality when it comes to clarity because they are always done in a studio afterwards. When I started to watch english movies, I was thrown into an abyss of very hard to follow dialogue, but that was mostly because I was not used to hearing the actors speak on set during whatever they were actually doing.

However, that said, I do also feel it is getting harder with more action-loaded productions, which is basically everything in the past 10 years or so.