Cub Foods taking over the Uptown Rainbow Foods? Two thumbs up. Cub Foods' takeover of St. Louis Park's Rainbow Foods? Meh. That's the response from Business Journal readers, who seem mostly happy about the $65 million deal that has Roundy's Inc. of Milwaukee selling 18 Rainbow Foods stores to Cub parent Supervalu Inc., Lund Food Holdings, Jerry’s Enterprises, Haug Enterprises and Radermacher Enterprises. The Uptown Rainbow has frustrated readers over a lack of quality produce and a generally…