The prequels' writing is pretty cringe-worthy, and Episode I is absolutely worthless. It adds fucking nothing to the saga, and it's boring as hell, completely skippable. Episode II is meh as fuck, but III is honestly hated by association only (even if it still suffers from shoddy writing). All in all, it's a great movie, and it's actually better than VI (which is, imo, noticeably inferior to IV and V). The lightsaber duels were great there.
The Dookan fights on Episode II were absolutely TERRIBLE though. I'll take the Obi-Wan vs. Vader fighter of IV any day.