I think it looks cheap and tawdry, especially with the misspelling. I think that someone in the parish who is concerned about this issue should ante-up for a professionally-made sign.
BTW, we see a lot of these kinds of signs often in Protestant churches, so I have a little problem with this kind of thing being done in a Catholic church.
In all honesty, I don’t think that this sign will help the noise level. In a few weeks, people will get used to it and ignore it. Also, everyone who makes inappropriate noise will not realize that the sign is referring to them–they will think it means someone else.
I do agree with those who want to see carpeting removed in churches. For me, the reason is allergens and molds–carpets are great reservoirs of both. Also, it’s easier and cheaper to clean floors than carpets.
What I think helps noise levels in the nave to decrease is when a priest kneels at the front of the nave before the Mass. But even then, a lot of people just get used to him and ignore him. Oh, well.
I wonder if little placards (permanent, not cardboard) at each pew, facing the parishioner, would help? I’m talking about sometihng professionally-made, the kind of thing that a person puts at their business desk with their name on it, only smaller, of course. They would be attached to the side of the rack where hymnals are so that only someone with extreme sight limitations would miss them, and everyone else would see them throughout the Mass. I realize this would be a dreadful expense, but again, people who care about this issue would have to ante-up and pay for it. I fear that the placards would be pulled off by busy little ones, and the sticky residue on the pews would look tawdry, too.
It really is an issue that seems to have no answer, so IMO, the best way to deal with it is to work on finding a quiet place in your own soul to which you can go and pray in any physical setting, and not getting upset over the physical environment around you because there’s really nothing you can do about it most of the time. You might shush one person or family near you, but you can’t shush everyone in the nave, unless it’s a teeny tiny nave.