Pre-ordered it because I am curious. I entered the GeForce NOW beta because I am curious. It's BOGGLING to me how threatened people seem by the concept of game streaming, especially where Stadia is involved. And good news for everyone, the latency thing is more or less figured out. At least in my testing of GeForce NOW, latency is unnoticeable most of the time, I expect it will be only better with Stadia. I am saying this as someone who doesn't play counterstrike or APEX professionally, of course.
If you already have a better than average PC, you aren't necessarily the target audience.
If you have poor bandwidth or a bandwidth cap, then potentially you aren't the target audience.
If your brain stem tells you physical media is always better, then that's not really a logical argument, but it's fine, you are not the target audience.
If for some reason you have blind allegiance to a particular brand of rectangular box that plays the games you love, then that's not a logical argument, but it's fine, you are not the target audience.
That's no reason to look down your nose at an emergent tech that has the possibility of making gaming more accessible and convenient than it has ever been before.
I can't bring myself to turn on my PS4 anymore, it's an old, clunky, and the sounds that come out of it are louder than the game volume I typically play at. We had a great run, but that time is over.
I have a pretty updated PC, I love using it, but I also work from home 100%, share my office with my cat's litter box (UGH)... after 8-10 hours M-F, I just can't bring myself to come sit back down in this office at my computer at the end of the day after my kids go to sleep. Also, 80% of the people I game with do not have PCs, so things like borderlands, destiny, etc.... it's just not in the cards for me to play that type of game there. Also, the only time I play games offline is if I am using my switch handheld in an airplane or something... the always online component is not a deal breaker for me.
Stadia offers a change of pace for someone like me. Happy to take a look at it. They may fail to deliver. If they do, that's OK, I can return it, or just keep it for the hardware goodies. I'll have something to tinker with for a few months until the Next Big Console comes out. Then I'll buy whichever rectangular box looks the most promising, and try that out as well. Anything is better than turning on my jet engine PS4.
If Stadia does deliver, then it's another great option for gamers. I really like the idea of hardware that will evolve over time without me having to purchase a new rectangular box.