Happy to give Silva a go, but he is very young, and doesn't have a track record of building teams. The last 4 years, he has had 4 different clubs. 2 of these clubs he quit, 2 of them he was sacked, which is a worry.
However, he had a very impressive record at Olympiakos, 79% win ratio, and has a win record of 53% overall in 265 games. You could argue that most of these wins were in easier leagues, but nevertheless, it shows that his tactics try to win games, not avoid losing.
So, not bad at all when you consider Moyes, Koeman & Martinez both had a win ratio of between 41%-42% here. That seems to be the benchmark to beat. If we have ambitions of top 6, we need to get this nearer to 50%.
I know most people consider the Greek league to be a bit of a tinpot league and they are probably right, but plenty of top managers have been considered to have failed there. Jardim and Cuper being the biggest names.
Still doesn't mean that Silva will be guaranteed success with us but he did a very good job at Olympiakos. I think they brought in something like 15 new players when he signed so he pretty much rebuilt the team. And he had them playing proper entertaining football. If you ask Olympiakos fans who their favourite manager was he'll be a close 2nd after Valverde. He did leave them under a bit of a cloud, amid rumours that he couldn't handle the pressure though.