Its funny to me to hear so many people chiming in that people "shouldn't" get plastic surgery.
First, people seem to be focusing on the face only...plastic surgery applies to the entire body, not just the face.
Second, I know quite a few people whose appearance has been significantly improved by plastic surgery. Do you know what two of the most popular plastic surgeries for Chinese men are? Chin implants, and cheek implants. It may sound trivial, or vain...but folks, it makes quite a significant difference to their appearance. I have one Chinese friend whose chin was quite 'weak' (very little chin)...he got plastic surgery to get a chin implant, and it made a huge difference. Not just that he looked more handsome...he looked stronger, he looked more trustworthy. There is a tendency in many cultures to associate a 'weak' chin with physical and/or moral weakness.
And like it or not, it is an absolute reality that people who are more physically attractive will, all other things being equal, get better treatment, better opportunities, and higher salaries. Call it superficial if you want...but if I've got a reasonable way to improve my salary and my opportunities that involves a little nip and tuck, I see no reason why it should be considered 'wrong' or 'vain' or 'trivial' to do so.
Yeah, there are people who go overboard. Yeah, there are people who look terrible when its done. But there are an awful lot of people who've also benefited greatly from it.
You'll notice a bad plastic surgery job specifically because it is bad. You won't notice a good plastic surgery job because it is good. The fact that you can hold up some examples of bad surgeries doesn't in any way present a defensible case that people therefore shouldn't get it. Hell, by that argument, there are people who get bad haircuts...so therefore, I shouldn't get a haircut.
ETA: I've never had plastic surgery, personally. But I could see myself doing it in the future. And certainly have no problem with others who have it.