norxau lujvo

x1 is mediocre (in terms of benefit) for x2 by standard x3

See no'e, xamgu, xlali, norcre

In notes:

xamgu
x1 (object/event) is good/beneficial/nice/[acceptable] for x2 by standard x3.
norcre
x1 is mediocre (in terms of skill) at x2 (ka/activity) by standard x3