This is certainly the best version of the Arthur legend there is. The worst thing about new versions of old British legends are the fact they are often made by and starring Americans, and they often don't even make an attempt at a English accent (First Knight, Prince of Thieves etc) and these make them seem really stupid.

Merlin was a decent enough series, but a little too kiddy and straying from the works of Mallory.

The acting is rock solid, the effects although poor (it's 1981, let's be fair) don't really matter since they aren't integral to the story. This is about a quest and magic and swords and knights, not about special effects.

I own it on video and watch it now and again, and I hope that if Boorman ever makes Knight's Castle that he brings back Nicol Williamson as Merlin, because he's just too good in that role (despite the fact he must be really getting on by now).

Watch the movie, enjoy the legend!