After two horrible months of bad movies, the first weekend of March is starting to look tolerable. Okay, so there’s still the Milla Jovovich sci-fi actioneer “Ultraviolet” to avoid, but besides that, there are a handful of good movies worth spending your hard-earned money on. Along with the first installment of the Russian fantasy trilogy, “Night Watch,” which goes into wide release this week, two new films about city blocks are opening: the Richard Donner-directed thriller “16 Blocks” and the Dave Chappelle documentary “Block Party.” Both movies will still only attract a certain audience, but they’re also both bound to surprise those who wouldn’t usually go to see them. Take a chance this week and check out one or the other. You’ll be pleasantly surprised…