I’m a big fan of it, and like Justin I think the recent edition starter set has pretty much all you need, if you’ll be paying for it.
I have historically ran it as duets, though I’ve also recently ran it as a longer form campaign. It works perfectly fine and I often steal the “Personality Trait” system it has for other games (such as my current one).
Having said that, a lot of the stuff that Pendragon has isn’t directly gameable, so to speak. As in, there are older setting books for each region of Great Britain with maps and keyed locations, but the keys are stuff like “A town”, “A motte and bailey castle”, “A bridge where the Devil appeared once”, etc.
Also, the latest edition dismembered GM information in one book and player in another, which is mostly fine, except the bestiary is in the GM book, which is quite an important part of the game, so be conscious of that if you’ll be getting it.
You might see a lot about the Great Pendragon Campaign if you look for it online, but my honest opinion is that unless you and your players are very into Arthuriana, it will do little for you. And I do mean into actual Arthuriana, as in having some knowledge of Geoffrey of Monmouth and having read The Death of Arthur, not just enjoying The Knight of the Cart or wtv, because quite a few of the entries are either events from those or foreshadowing for events, and these do not hit at all if your players aren’t at least aware that this was a momentous occasion or that you just stopped a canonical event.
Much like Glorantha, the best way to play Pendragon is get the book, read it once, and then fill in the gaps yourself. The adventures range from “ok” to “basically a series of linear cutscenes”, and the sourcebooks mostly expand the basic game in increasingly pseudo-feudal ways which are really unnecessary for the short term.