Wiktionary
vb. 1 To like; to hold in high esteem; to look upon favourably. 2 To consider deeply. (qualifier: usually in the negative)
Usage examples of "think much of".
Smith did not think much of the ilium site but chose to keep the peace and yielded.
To these charms of feature and person were added others more indefinable--an air of purity which only the soul can impart, and of abstraction natural to such as think much of things impalpable.
He looked pretty awful, but I didn't think much of it at the time.
From a moral point of view, I cannot say that I think much of your great renunciation.
The main address was to be given by the party's president, who did not think much of his subordinate's oratory.
I don't think much of your investigators for only getting the list of those on the fifth floor and above.