Love all the comments that say "I don't care about these characters." Of course you don't, they're new characters (or possibly little-known comics characters disguised with different names, I suppose) and all we know of them are these little blurbs. Nobody ever spontaneously liked a character without reading or watching something with that character in it. Really, this information doesn't change anything; we knew we were getting a SHIELD series with new characters, and given Whedon's history and the show's context, these are just about exactly the archetypes you would expect to see in the lead roles.
Which is exactly why we don't care.
Who wants to watch a TV about new characters when we could've had The Punisher, Hulk, Mockingbird and AKA Jessica Jones. I'll take any one of those over this show.
I am pretty sure Marvel took a look at what DC was pumping out on TV and decided that original content is better than adaptation. I feel that any show that was superhero-based may be too costly or simply not engaging week to week. Punisher and Jessica Jones may be too violent and dark for ABC. Hulk would probably be no good since I am sure Ruffalo would not do TV. And I feel Mockingbird has an equal chance of appearing on this show as Dum Dum Dougan or Maria Hill.
Original Content gives creators more room to play with the world. If they did an adaptation of an established character or title, there would be more pressure to stay "true" to the source material. I like the fact that Joss Whedon essentially gets to do whatever he wants with the everyday SHIELD Agent. We haven't really seen that kind of story from the comics and I would like to see the angle he takes this show.
If you don't care about the characters... fine. Characters are nothing without story anyway.