You're not alone in thinking that, I've always thought the same. Not only is it attention-grabbing, but it also puts the person being proposed to in an awkward spot if they're not sure if they want to say yes or not. Like, imagine the embarrassment if they said no? But now it's in front of dozens of people cheering/clapping etc. so pressure is pretty high. I wouldn't like being put in that position myself. I feel like proposals should be more personal and intimate, between the two people involved. Everyone else can celebrate later at the engagement party.

Yep, that's a weird place to propose.