First one was okay, I actually liked it and felt it was a decent start. Also one of my favorite soundtracks.

Prince Caspian was mediocre, and decided to keep the Witch as the main villain for no real reason. It was also injected with a bunch of pointless character drama that didn't come from the books at all, and just sidestepped the actual story at every possible turn. The 45 minute castle siege was something that was only talked about in the book, but was dismissed as a bad idea. It was a major step down in quality, but it didn't fully kill interest in the series.

The Voyage of the Dawn Treader is many a fans favorite of the books, and they butchered it into a thousand pieces. Also kept the witch around from the first book as the primary villain for no apparent reason, again. It bombed so bad no fourth was ever made, and no one I know would have paid to see one.

For now the franchise is "safe" because no one would want to risk reviving a bomb. Though it's ties to Christianity are so well known, a remake is more likely to just get canceled than be wokefied.