How I remember it is that S4 and S5 were both partly cool and partly disappointing but for different and almost opposite reasons - in S4 the overall arc and the key episodes were good but a lot of the episodes along the way were just really dull to watch. In S5, despite the intriguing concept the execution of the overall story and main plot points were really weak, but it has a bunch of really fun standalone episodes. But that's just what I remember my opinion being when I last watched it almost 20 years ago, idk if I'd think the same now