Throughout the first 2 acts, what is your opinion on Caliban? Do you think he was born savage or did he become savage because of Prosperos mistreatment?

There are aspects to Calliban within the first two acts that point to a deep sense of feeling and personal angst. Certainly Prospero alludes to this with his speech about Calliban's progression out of savegery,

Took pains to make thee speak, taught thee each hour
One thing or other: when thou didst not, savage,
Know thine own meaning, but wouldst gabble like
A thing most brutish, I endow'd thy purposes

My point is that nobody is born a savage and turned into a poet by act 3. Calliban had these traits in him all the time. Like all of us, who were once blubbering babies, he just needed guidence that he never had before. There are heavey undertones of European Colonialism here but I think that Calliban had these traits in him to begin with.