This was a fun series of games. They are especially fun if you've watched some of the source material they're constantly referencing and alluding to, like The Man From U.N.C.L.E. (the 1960s one, not the 2010s movie), Get Smart, etc. Still holds up.
Austin Powers references and parodies the same material, though leans a bit more toward the old Bond movies. NOLF may have referenced Austin Powers as well, but clearly pulls from a lot of the older material.