I would say 2.5's dungeons are easier than 2.4's. Some of the 2.4 bosses, like Sabotender Emperatriz, were hard wipes if everyone wasn't dialed in on mechanics. Some dudes, like Captain Madison, gave undergeared (or just unfocused) parties some trouble.

I think 2.5's bosses would also cause issues if 2 or more members didn't know the mechanics, but I had a pretty easy time going through them figuring out the mechanics from scratch. I think the moves and how you're supposed to handle them are telegraphed much more obviously this time around.

That said, I like every one of 2.5's dungeons more than 2.4's. Lots of interesting trash pulls and change-ups to boss fights. Nothing feels familiar or similar to past fights! The atmosphere, music, and visuals are a big improvement, as well.