I am glad Bill chimed in. As you can see, he clearly knows his stuff.
On the matter of what architects find "acceptable" — for whatever reason, I have always enjoyed courses that reserve the par-3 for number 4 or later. The reason for this is that I truly enjoy par-3s more than most other holes, and I am inclined to be better prepared for the par-3 after a few holes to warm up. I think golfers, overall, also like par-3s best. The reason is that this is the only type of hole where we have the chance, realistically, to make a "1" during the round. Also, it is the only approach to a green where the golfer must begin from a set location — not one devised by his/her round, but set in stone by the golf architect, the superintendent and the order of rules.
My ideal opening hole is a relatively open design with all hazards in clear view. I also like a beacon, or aiming device, such as a lone bunker or landmark. At the green I prefer a wider green than usual, and nothing too out of the ordinary. I do not mind a dog-leg. In fact, a bending hole can be nice because it has a sense of leaving and getting out of visual range from the clubhouse.
I also think golfers, in general, enjoy the good par-5. So, when possible, I try and hold off for a few holes before unleashing the first par-5.