I wouldnt consider Menem a Peronist at all- but basically, Peronist is undefinable- I have a lot of friends who can argue what it is for a week solid, and never agree.
Menem privatized all kinds of things that Peron had socialized.
He helped the 100 or so rich families to buy state industries at a pittance of value, and he pretty much followed the neocon bankers ideas from the US and Europe.
A lot of things that were actually intentionally done for sound economic reasons (even if these were debatable by different economists) are all lumped in as "corruption".
Certainly, there is tons of corruption, although not on the scale of, say, the USA...
But the idea that it was "corruption" or "incompetence" that lead to Peron instituting a series of rules and laws to encourage Argentine industry, and discourage imports, to subsidize health, housing and education for workers, to keep strong unions- these were all deliberate decisions, made for reasons that, while many may not agree with, were indeed economic theories, and, in many ways, have kept the existence of a middle class in Argentina alive.