Well, i guess gaming may have been bad for you then, but thats not really enough to jump to any sort of conclusions. But for the sake of the argument i'll put myself up as a counter-argument.
I've been gameing for around 20 years, started before i can even remember, my parents have told me they pålayed video-games with me when i was 2 years old and coudl ahrdly talk.
I always did well in school, and i graduated gymnasium (the step before university) with the best grades in my class.
At age 15/16 (just around my birthday, so i don't remember which) i won the junior national championship in sports climbing and got a 10'th place in the adult national championship.
I'm in good shape.
I'm pretty good at drawing, and are using those skills to help me in my current education as a 3d digital artist, which will eventually lead to jobs in the film and gaming industry.
I had no problem working around 50 hours a week for 2 years, evening, weekend and night shifts to save up for my school.
in 2 months when i turn 22, i'll have my 6 year "aniversary" with the company i'm employed in.
While i've never been a player (not to be confused with gamer) or been swimming in girls, i've never had problems with girls or getting girlfriends.
I have plenty of friends.
So, i don't see how gaming have affected my life negatively, ofc theres always the "but what if" argument, and you're right, if i had spend every hour i've been gaming doing something more productive, i might have been more ahead in what i'm doing now, in my case 3d graphics, but in this case, gameing sparked that interrest and lead me that way, but it might have been something not related to gameing.
But you could say that for everything you do
What if you had ignored relationships totally, then all teh time you've spend with girlfriends/boyfriends could've been used to study.
All the people you talk about, musicians and athletes, unless they're gonna become professional musicians and athletes, they've spend a lot of time doing something that didn't further their career as well. Athletes will ofc get in good shape, which will keep them mroe healthy, but musicians (no hate meant, i play the guitar myself, though i'm not that good at it) are just good at something that interrest them, and which they enjoy, even though it doesn't further their career or succesfullness, just like gaming.
To follow your logic, you should also throw out your tv, and any litteral works of fiction (non-work related books) unless ofc you're studying movies or litterature.
Personally, I don't think you can really go through life without having some interrests that, even though they're not helping you towards some big goal, interrests you, helps you unwind, and makes you happy.
Sure, gaming may not be as prestigefull a hobby as music or sports (if you're good at them) but are you really gonna live 100% for the sake of what others think superficially about you, stuff like prestige status etc. Or do you want to live to be happy, which will also affect how people who knows you personally thinks about you in a less superficial way.
personally, i've chosen 3d graphics as the career i want to pursue, cause it really interrests me, sure i have the grades from school to study something that would lead to a job with more money, but seeing how i'm gonan spend neary half my wake time for the next 40-50 years doing what i choose now, i'd much rather pick something taht interrests me teh most, and not just what is highest ranked on some invisible social scale of prestige and status.
I think this respond is getting way too long already, so i'll end it here, hope you're as patient as me, and cares to read through responses over 6 lines long.