The one thing about Star Trek III is that while it's not great, it's an intergral watch because of the death of Kirk's son...
BTW, bestbuy has had all the star trek movies for 9.99 for a while now, so anyone who needs a title or two to round out the collection, go to the store and see if they've got it (Doubtful) or get it off the website...I hope the HD-DVD and Blu-ray versions don't come in god-awful packaging like the DVD's did...