It depends on how you have shaped your own reality. If you feel guilty about it then, yes. If you truly enjoy it then, no.
I have given this some thought before, and I believe that sports can be a waste of time, but can also not be a waste of time. Sports are NOT a waste of time if you actually play the sport you're watching. If you want to get better at that sport, you're going to have to watch professionals playing it because that's a part of becoming better at anything. No poet writes poetry without reading other poets, no musician composes music without listening to other compositions, no artist paints pictures without studying other paintings, and so on. If you want to become a better basketball player, you're going to have to watch Kobe, and LBJ and so on. So in above scenario, no it isn't a waste of time. However, if you're just some fat dude chugging beer and watching football and you don't even go outside to toss the old pigskin around yourself once in a while, then yes, I would posit that you are most likely wasting your time--but I figure most people like that couldn't give a **** in the first place. One sport that's never a waste of time, regardless of whether or not you play it, is BASEBALL. It's a "thinking man's game", as it were. Studying stats, figuring out a player's statistical trends/patterns overtime, assessing scenarios, processing situational dilemmas, etc., coupled in with the excitement of the human factor and the human capacity for flaw, makes baseball perhaps one of the most cerebral sports in the whole world. This is probably why most people find it boring actually. Who wants to figure out numbers and percentages? Who wants to strategize against lineups and against pitchers? It's all a part of the thinking aspect of the game.
I guess my answer is, to try and break a blanket question down, is... it can be, but one should try not to let it be, a waste of time. How much time one might be wasting is relative to their life, and what they might otherwise be doing if they weren't paying attention to sports. People watch for different reasons. Nothing is that simple, and it's a question each individual should answer for his or her self. I watch as much as I have free time to enjoy. I don't consider it a waste of my time... and when I do, it's because I decide I have something better to do. A better question might be is, is the amount of sports you watch proportionate to the plague upon your ignorance and the gray despair of your ugly life. I would say 'not necessarily' to that as well, though.
Depend wat kind of fan for some it investment of time, money, heart, and tears. When the team losing for long period then ppl find different form of entertainment to replace it
Girls get drive and aggression necessary to close the leadership gap, prep schoolers and Ivy leaguers get to network and relax, white guys get diversity and a healthy emotional outlet, at-risk minorities get focus, discipline, and a sense of purpose, self-worth and belonging to the larger group. Perhaps the only people it doesn't explicitly benefit are middle-class blacks, who lag academically behind non-blacks with the same economic aspirations, and unwittingly re-inforce and re-identify with blacks' historical working-class social roles (this is one of the reasons motivated, high-achieving blacks were able to get into originally low-wage sports and entertainment jobs before other professions.)
Of course there are better things to do but everybody needs to have some entertainment just have your priorities in line. If your missing time with wife/kids, not studying, not working, cursing at opposing fans than ya you probably care too much..
you need to have some entertainment always play video games watch reality TV and other TV shows reading watchin movies all other activities you can spend your free time doing whatever you want, unless you are doing something ilegal or harmful for other people. that why is it called free time, you can waste it doing whatever you want. you can watch sports with the family, so you are hanging out with your family, doing something everybody likes. I would say NO, if you say yes then everything could be wasting time. and like others said, you have to do everything with moderation, even work, if you only work then you are not spending time with your family or friends.