I think some of you under estimate what a huge investment can do. Roberto Mancini and Sven would probably do about the same given similar investment. Yes, Clueless brought us down to 10th with a massive investment, but he's an exception (one of the few managers that can take a squad capable of top 3, and drop them down into mid-table) and we all know he's utter shit.
I think Sven, with the same money, and ability to replace the players (or whole squad for that matter) that contributed to the post-new years collapse would have seen him nearly or as successful as Mancini.
Di Matteo, not exactly known for his managing success at West Brom, went and won the FA cup and CL with Chelsea, and with another massive summer investment is top of the league. Again, Clueless was probably one of two or three managers in the past decade that would be able to spend 250 Million and still be mediocre (QPR is final proof of his terrible management).
I think Sven, with the same money, and ability to replace the players (or whole squad for that matter) that contributed to the post-new years collapse would have seen him nearly or as successful as Mancini.
Di Matteo, not exactly known for his managing success at West Brom, went and won the FA cup and CL with Chelsea, and with another massive summer investment is top of the league. Again, Clueless was probably one of two or three managers in the past decade that would be able to spend 250 Million and still be mediocre (QPR is final proof of his terrible management).