Warnock led QPR to the Championship title in the 2010/11 campaign and they made a reasonable start to life in the Premier League under him.
However, he was then sacked in January 2012 after a poor run of results and performances, with Mark Hughes hired to take over.
The R's retained their Premier League status by just a point that season but Hughes was dismissed when they made a terrible start to the current campaign, and his replacement Harry Redknapp has not been able to prevent relegation.
Speaking on the Footballer's Football Show, Warnock said: "If you look at the facts, I think my record in the Premier League was better than Harry's and as good as Mark's.
"We were told, keep out of the bottom three until January, and then you can bring in three or four players.
"We did that and then, to get to January and not have an opportunity to do that, is disappointing."
However, Warnock says he does not feel bitter about chairman Tony Fernandes' decision to show him the door.
"It's your club, you're entitled to do what you want, and they decided to go in a different direction," said the experienced boss, who recently left Championship side Leeds.
"They'll have got a lot of advice, from a lot of people outside, saying you've got to change your manager, and all sorts of things.
"Only time tells if it's the right decision and I don't think it was."