Well, I personally would have liked FabNic to use Steph in such a way that she had her own goals. Both 1) being a supportive girlfriend and 2) following Batman's weird orders to "test" Tim to make him a "better Robin" are both All About Tim. I am a huge TimSteph shipper, obviously, but I think Steph deserved and needed to connect with other characters, like Cass especially, and that could have been much more interesting than the really confusing and nonsensical plot that FabNic ended up doing.
I really think that Tynion didn't rely on hacker fu as much as people say. I think a lot of it comes from the negative impression that Batman and Robin Eternal #1 left on people, where he hacked that one guy's gun. But in Tec, he rarely did that kind of thing as his main contribution to the story.
Haha, I think a large part of why I loved Tec so much is that no joke, I love all of those characters. Batman, of course, Batwoman from Elegy and her n52 run, Tim from his time as Robin, Steph from her whole self, Cass from her time as Batgirl, Jean-Paul because of his conflicted time as Batman and his bombastic nature, Luke because of his connection to the Fox family. I didn't know about Clayface, but I was won over by Tynion's relationship between Cass and Basil. So it was a rare case of loving every character, and thus whenever they got screentime, I was happy. I think, too often, that my problem with team books is that I care about one or two characters, but I get irritated when others get screentime (that's certainly my problem with most Justice League and Avengers books). Good writers, like Priest or Whedon, can make me care about everyone (Priest's Justice League and Whedon's Astonishing X-Men were landmark runs for me), but on the whole, I think too many books expect me to care about everyone first. Possibly even Tec, because I DID care about everyone first.
I just hope that Tim and Steph (Steph especially) land in a team book that isn't too crowded with people I don't care about.