Smertin was an Abramovich signing. He was signed from CSKA Moscow, iirc, where he owns the company that sponsored them at the time.
I do think he did well in the 2002/03 season where we needed to qualify for the CL on the last day or face turning into the next Leeds. However, I honestly feel with all that money at his disposal, a better manager would've won the league in 2003/04, no matter how good Arsenal were.