For me 'Clockwork Orange' is like all of most of Kubrick's other films. Initially they have a visceral impact, but they don't hold up well. 'Clockwork Orange' when you're young is ground-breaking and stunning. Watch it again after a few years and it's trite, unsubtle, and unimaginatively directed.
Of couse, as you may have guessed, I don't much care for Kubrick -- I find him to be the most overrated director (except for maybe Spielberg, who has forgotten how to make a complicated movie).
By all means, though, watch it. It is (good or bad) a classic and influential film. Just be prepared to be disappointed, as it hasn't aged well. Partly that's not its fault, as any influential film suffers from dilution by imitators -- I laugh when I see people who have never seen 'Halloween', for example, complain about how cliche it is.