I have a lot of respect for Steve Keen. His book Debunking Economics is pretty much essential reading for anyone who wants to know the flaws in neoclassical economic thinking.
Like me, Steve buys most of MMT, not because it's a dogma (in contrast to the neoclassical view) but simply because it describes how things really are.
Like me Steve also has some reservations. Mine have been focussed on its attitude to tax (on which I may do more this weekend: it depends on the weather). Steve has focussed on MMT and the current account balance, where he thinks many's indifference is due to a US centric view.
This critically supportive podcast is worth listening to