Managers have to earn patience by showing signs that they are up to the job and learning from their mistakes. Martinez has shown none of these attributes hence why patience is thin. You also act as though three seasons is nothing, its more than most premier league managers get, Moyes deserved longer, Martinez currently doesn't. Obviously if he wins the cup that would all change. One of the only reasons people are confident though is because there's an assumption that United will be knocked out. If they're not they will be a formidable challenge to get past. There's still a long way to go yet people are talking about Martinez as a 'consistent trophy winner'. Baffling.