**_One of the Best Medieval/British Isle flicks_** Remember the three such movies of 1995: "Braveheart," "Rob Roy" and "First Knight"? "Tristan + Isolde" is better than all of them or, at least, on par. It shares plot elements of "First Knight" with the king's trusted protégé playing around with his young wife, but "Tristan + Isolde" is just overall superior. James Franco plays the brooding Tristan, who has good reason to be sullen, except when he escapes into Isolde's arms in secret. Sophia Myles works well as the Irish princess, Isolde, who's given as a gift to the king of the Brits, Marke…