He doesn't have a stellar CV really but it is impressive. He did well at Benevento and Sassuolo, won the cup with Donetsk and left them top of the table, finished second with Marseilles (which is as high as they can realistically finish) and did a very good job with Brighton. Pep has described him as one of the most influential managers of the last 25 years. His CV is not laden with trophies but he's clearly talented.
Someone likened him potentially to Bielsa on here - I think that could turn out to be a good comparison. Either way, given all that and given the backing we've given him, there is absolutely no doubt in my mind that he will turn this around. First two months of the season get written off for me - I really put no stock in the results, disappointing as they are.
This season is truly transitional for me - we finish away from the relegation zone, it'll have been successful IMO. We can still easily do that.