I really like RWBY, but I can understand why many people don't though. Volume 1 was pretty bad outside of the last episode fight, and I would imagine most people would just quit there, or the arc right before it because for 4 straight episodes we have a side character dealing with a bully that could easily have been solved if he just told anybody else.
Volume 2 was kinda meh, the fights were cool but the story was basically the main characters doing a whole lot of nothing. But at least background characters aren't all black silhouettes anymore.
Volume 3 is really where it starts finally getting good since the animation improves a ton, it has a lot more fighting, and there is actually some character and story development. The last few episodes were also breathtaking. Overall very well done.
Not sure if I like the Volume 4 animation so far, on the surface it looks better, but I guess might take some time getting used to. But the story so far has been meh. I like the new villains and types of Grimm but that's it. The story is kind of dragging on too much, 3 episodes and all that has been done is explain what happened to the main characters and villains after the time skip with 2 random fights thrown in, which I feel like could have been done in one episode, with RNJR plot happening afterwards.