My brothers miniture pinchers are crated during the day.. he started off keeping them in the blocked off kitchen, but Rocky decided the table would be his new chew toy
Casey and Rocky both absolutely LOVE their crates, all you have to say is "kennel up" and they run for it. Sometimes when you get home and open the door to the crates they don't come right out because they are just so comfy. They sleep in them at night as well.
As long as the crates are the correct size, and your puppy is physically able to hold their bladders that long, there is nothing wrong with crating. I plan to crate my yorkie, although she won't have to be in it often as someone is usually home. If it gets to the point where she is alone more than a couple days a week, I will probably get a x-pen so she has more room to move around.