Yes imo just the first 2 or 3 issue (before the "secret invasion ties in); they are not very good but an okay intro for the GotG, specially because it's related to Annihilation Conquest, after that, DnA run is pretty mediocre (too confusing, with too many crossovers/events).
But Everything written by Giffen for Marvel is really amazing, that begin with "Thanos Samaritan" (with the return of Starlord) that most peoples seem to forget, the Drax mini, both titles are very important and introduce the Annihilation event, Giffen is the real force behind the new cosmic Marvel, and indirectly for the GotG movie.