I agree with you that Daredevil was fantastic and easily Marvel's best TV effort so far, but I don't agree that AoS is terrible and needs to be put down. It fills its own niche (it's basically Daredevil's polar opposite in terms of tone and pacing) and does a pretty good job of it. It's nothing amazing but it's improved quite a bit from its early episodes and is pretty fun to watch.
Agents of SHIELD and Daredevil aren't trying to fill the same niche, so it's not really a matter of comparison. AoS was designed to be an "entry-level" Marvel TV show -- a fairly standard TV procedural that happened to take place in the Marvel Cinematic Universe, something that would be accessible to viewers new to the MCU and accustomed to a certain type of weekly TV experience. Daredevil, being on a commercial-free pay service, is more of a specialized, premium-TV project. In its own way, it's just as entry-level, starting out in a very grounded way and avoiding the colorful costume and nicknames until the very end, and only hinting at some of the deeper, more mystical elements from the comics; but it's aiming for a different baseline audience to begin with.
And there's room for both. It's good that the MCU isn't all one type of thing, that it has something for multiple different audiences and tastes. Arguing about the merits of AoS versus DD is kind of like arguing about the merits of The Sarah Jane Adventures versus Torchwood. They're not going for the same audience or trying to tell the same kinds of stories. And it's good that they aren't. I think they're both good at doing their own distinct things.
Indeed. There's plenty of precedent for spies and agents in fiction (and maybe in reality for all I know) using code names when talking over comms on missions. It would make perfect sense to call Bobbi "Mockingbird."That said, AoS has had Quake, Mockingbird* and Deathlok, with the promise of a larger team of supers to come next season.
*They need to come out and use these names. Especially "Mockingbird". SHIELD has had agents code-named "Hawkeye" and "Black Widow" (and "The Cavalry"), so it's not an unprecedented thing.