Easily my favorite show.
I started watching RWBY midway through 2020, and immediately became hooked. The premise is intriguing and original, and the imagination that went into its' plot is boundless. At the same time, the characters are built upon stories and themes that have been around for centuries, so there's a sense of familiarity. It's heartbreaking that Monty Oum wasn't able to see the continued success of his masterpiece, but I'm sure he would be pleased.
If your main purpose is following the plot, I would recommend starting with Season 2 or 3. Season 1 establishes the protagonists somewhat and has some entertaining moments, but the animation in the first two seasons is a bit choppy, and the first season's plot, script, and very short episodes leaves a bit to be desired. However, this begins to change with Season 2, and even more dramatically with Season 3. The fight sequences are phenomenal from the pilot episode, and the plot, voice acting, world-building and character development continue to build with each season. The music by Jeff and Casey Lee Williams is superb throughout.
Considering RWBY's lighthearted tone at the start, I initially thought of it as more of a comedy, despite the foreshadowing. Thus, I was astonished with how dark the story became from Season 3 onward- which make Team RWBY's struggles, victories, defeats and emotional bonds all the more enjoyable to watch. The antagonists are appropriately formidable, yet equally complex, particularly in their origins; both heroes and villains come from a wide range of backgrounds, are made relatable, and often have to suffer, learn and/or recover from the fallout of serious mistakes. The characters' allusions to classic fairy tales, literature or myths- drawn from a variety of sources- is particularly original and clever, and shows how much the writers have done their research. This is a show not afraid to explore in breadth, not just depth, and I don't think I've ever found a TV series- animated or otherwise- that appeals to me more.
Fair warning, there are certain moments that can get topical, and/or fall into certain negative tropes- paticularly in Seasons 1, 5 and 8 (*cough cough IRONWOOD); 5, 8 and especially 9 also have some pacing and characterization issues. No work of art is perfect, and RWBY has points where the writers make mistakes or fall short. In addition, it could benefit from a few more non-white characters. But while worth acknowledging, they do not detract from its' strengths and continued potential, or my enjoyment of it. I would however, advise avoiding the fandom; while I appreciate how devoted people can be to art forms, the online fandom of RWBY can be polarizing and toxic- as many online things are.
If you enjoy drama, fantasy and superb action sequences, this is one of the best animated shows you can find- and the fact that it centers around four strong female protagonists, is a refreshing change. Looking forward to Season 10!
My ranking of the seasons, in descending order: 7, 6, 3, 8, 9, 2, 4, 5, 1. 9 and 8 would have been higher on the list, but the pacing issue was just too distracting.