It really takes a particular mindset amongst all the players for Pendragon to work. It's very much about chivalric ideals, naturally, which can grow tiresome for players who simply want to kick in doors and grab loot.
If you can find them, I would say take a look at Blood & Lust, The Spectre King, and The Grey Knight. These are, in my opinion, some of the best Pendragon books out there. They are either adventures (The Grey Knight) or collections of adventures (Blood & Lust, The Spectre King), and definitely will give you an idea of what Pendragon campaigns should be like. Knights Adventurous is also very good, but if you have the latest edition of Pendragon (4th, I think), you won't need it, since most of it was put into the main book.
Blood & Lust has what I feel is almost the archetypal Pendragon adventure - The Adventure of the Heart Blade. This is an adventure in which a PC knight (with help from the other PCs occasionally) woos a lady love, and must perform various tasks to prove himself. It also involves finding the Heart Blade, a pretty cool magic sword that gains powers from love.