Elizabeth misjudged Charlotte, and what she would and would not do when it comes to marriage (grossly, in fact!). One could argue that this was a larger error, seeing she had years to know and understand Charlotte. I don't consider that she judged those people (listed above) correctly as any mean feat... how difficult is it to determine Mr. Collins is ridiculous, the Bingley sisters are supercilious, and Lady Catherine is an overbearing windbag? (Unless one is wanting to think good of everyone like Jane, of course) Those whom required a little more "digging" (Wickham or Darcy), she was incorrect (grossly so, again). Perhaps not entirely incorrect as regards Darcy's manners (or lack thereof) but completely incorrect as to his moral character. Furthermore, she praises Bingley on his desire to please during her stay at Netherfield yet after his abandonment of Jane, she faults him for this same characteristic.