The Iliad is one of those books which can be made or broken by the narrator. With this rendition, Anthony Heald has immediately joined my list of favourites (Patrick Tull, Nigel Lambert, Stephen Fry..) He breathes life into every one of the characters and more than makes up for any quibbles you might have with the translation.
I did not quite like the Butler translation read by Lescault. Butler uses Roman names for Greek Gods, and Lescault's narration is rather bland. Heald injects so much energy that you'd find a grocery list interesting (and to be frank, there are bits of the Iliad which are pretty grocery-like in character)
As for the book - well, it's the Iliad! A magnificent crusty old monument whose shadow falls across Western literature through the ages... well worth your time.
Having listened to both Naxos sets (Anton Lesser), Blackstone (Ralph Cosham) and (Nadia May) for some years, I have to say that Griffin really holds the listener. You can soon skip the biography if you wish. You can also enjoy and learn from 'Paradise Regained' as this, too, is really an added bonus in this set!
If you are troubled with understanding at first, read Lanzana's novel or his plain English version. C. S. Lewis has a famous 'Preface'. Nicolson's 'Reader's Guide to John Milton' is also a great way to start. Blarmire's 'Milton's Creation' is a superb commentary.
Keep listening to Milton, especially this set, and you'll find a life-long friend - by far the best writer of all!