The trio were promoted from the npower Championship last season, with Warnock's R's winning the title ahead of Norwich.
Swansea have impressed in the top flight since their promotion via the play-offs and face QPR this afternoon, while Norwich have really looked troubled.
Rangers have not done quite so well, but Warnock said: "I think you have to say Norwich and Swansea have adapted better because of their superior positions in the league.
"But I look overall and it has been a massive change around.
"Obviously [chairman Tony Fernandes] did not come until the last second and we had already bought some players in.
"The whole ball game changed when the new owners came in and we managed to get some new faces in. Not enough (faces), and we missed out on a couple right on deadline so we know we need to, as quickly as possible, get certain players in.
"We were hoping we could get away with certain positions but it is not happened like that. We have been punished."
One of those Warnock tried to bring in was Watford striker Danny Graham, who instead joined Swansea in a £3.5million move.
"I had Danny Graham in my house," Warnock said.
"I thought that [a deal] was all done and dusted.
"He will be playing against us and it would have been nice for him to be with us.
"He is a nice lad but that happened on four or five occasions in the summer.
"Doing a lot of work, spending a lot of weeks chasing players to finally get them to agree, and then not to be able to sign them was a massive blow to me.
"It meant it was a waste of time for sort of eight or nine weeks when we really should have done some of the business.
"Because of that we had to change targets, looking for different types of players and it was never going to be the same.
"It really has been a bit of a mixed bag and I think both Swansea and Norwich benefited from getting on with their business and planning it all.
"We chopped and changed, were spurned just before the end of the deadline, which is why the only objective for us is staying up.
"We have to be positive. Yes, we need certain help in the squad to push us on but I think we're quite capable of doing that and finishing strongly."