We know he’s found the woman of his dreams. But the sophisticated screenplay by Richard Curtis piles clever comic roadblocks in their path, not the least of which is the third wedding Charles attends-Carrie’s marriage to another man. If this breezy and bawdy tale has a flaw, it’s in the depiction of its enigmatic heroine. Actually, she’s incomprehensible, and the winsome MacDowell hasn’t enough resources to flesh her out. Fortunately, there are too many other delicious distractions to’ make this a serious bother. There is Rowan Atkinson’s priceless farcical turn as a bungling novice priest. There is Simon Callow’s rude, acerbic gusto as the gayest member of the set; Charlotte Coleman’s punkish ebullience as Charles’s flatmate Scarlett, and the unexpected poignance of that one funeral. Fluff with an edge, “Four Weddings” brings a venerable old genre delightfully up to date.