Actually "spectacular" is an adjective and not a noun or verb. Spectacular is a state of being, but does not define what that state is. It could be good or bad. It’s like saying somebody is really amazing: it’s not necessarily a compliment. I think Trump chose the word very carefully: to flatter the gullible lad yet remain non-committal. “Well will you look at that! Isn't he, you know what I mean, that's just so, it really is."