I import MIDI scores but the slurs, articulations, and other details are not supported in MIDI so you will[unless a miracle happens and Apple adds music XML2 as import/export option] still have to learn the score editor, what helped me a great deal was J. Prischl's "Logic Notation Guide", available only from his web site[google the name and title]. The guys at Logic Pro Help [this forum] where amazing in how helpful they are-they even taught me to successfully use the score, and I'm an idiot!
The Myriad does covert PDF to it's own crappy softsynth's sounds, but didn't help any getting score into Logic. I bought the Full version of SmartScoreX, which can scan image scores and using OCR you can correct them, but we are still stuck with no import/export in Logic via xml, as in Finale and Sibelius. Even Cubase 5 only works with XML 1.1,which is actually worse than MIDI and XML2 is the latest version of music xml from recordare.com.