As far as full cycles go, Chailly's has got to be one of the most consistent along with Bertini and de Waart. You're right, the M2 is not great, but it's at least still good. The M7 is weird, but I admire it. The M3, M4, M5, M6, M8, M9, and M10 are among my favorite recordings of those works.
Strangely, it seems no one really talks about the Chailly Decca cycle anymore.