Charter Communications has been upgraded by financial analysts following a successful fourth quarter in which the US cable operator gained 300,000 broadband subscribers. Time Warner Cable (TWC), which Charter closed its acquisition of last year, was considered the world’s worst cable company just two or three years ago – now with bullish CEO Tom Rutledge at the helm, Charter is making a comeback. TWC attempted to influence the US broadband revolution by lowering prices for very poor internet services, resulting in widespread consumer backlash. Under Charter ownership, subscribers are paying reasonable prices for reasonable broadband services –repairing a damaged reputation and growing revenues as a result. It’s not rocket science, but are the cracks in the TWC side of the…