You can neaten up the edges if you slip the first edge stitch purlwise with the yarn in front. Knit or purl the last stitch of the row. Try it out and see if you like the chain edge on the ribbing.
If the ribbing becomes part of a seam, the irregular edge really won't matter.
They can be loose. I don't care to slip the first stitch, that makes them looser and messier for me. What I do is work the first one, pull the yarn a little, then do the next couple sts a little tighter and that makes them more even. Washing will also even out the stitches too.
Mine are, they're looser than if I knit or purl them. The reason is, they span 2 rows so there's less attachment to the rest of the stitches. It probably has to do with my looser gauge to begin with, but I get very neat and even edges with my method.