Collocations for disappointing - adj.

be, prove, seem
find sth

extremely, fairly, very, etc.
bitterly, deeply, desperately (BrE), hugely (esp. BrE), terribly
The movie was terribly disappointing.

a little, slightly, etc.

for
This was very disappointing for all the fans watching the game.

to
That was very disappointing to me.

Disappointing is used with these nouns:
aspect, display, draw, finish, news, performance, result, return, run, sale, season, showing, start, turnout