I'm hoping we'll see another side to them in ME: Next. The Batarians need their own version of Legion, basically. Before Legion the Geth were just allies of Saren and xenophobic machines that killed all organics that came close to their space.
Yes but at least, with the geth, I could sort of understand them, what with the quarians trying to wipe them out as soon as they realized that the geth achieved sentience and all. Even before Legion, they were pretty cool because they were this unknown alien menace.
The Batarians on the other hand are not very alien at all, they are all too human and a cliche representation of everything that we are probably not very proud of.
The original concept for the Batarians wasn't even that bad, IMO. I think they were supposed to be the guys who actually got trampled on by the insanely fast expanding humans. They were supposed to be the mirror for what could have just as well happened to us. They didn't want to make them too sympathetic because they didn't just want to make them innocent victims but rather, the loosing side of a war between two underdogs that are both trying with all their might to earn the power to play in the big leagues of interstellar politics. They were supposed to be the obstacle, the inconvenient competitor that we had to trample down in order to achieve our goals. In that way, they were supposed to make us question our own methods even while we stood on the winning side.
The concept is brilliant IMO but unfortunately, it very much failed in the execution stage. The problem was that the Batarians were put into the role of the aggressor too often and the fact, that they were as well victims of humanities relentless push was not shown enough. Oh, we get told this a couple of times and it is hinted at in many planetary descriptions (especially in ME1) but it is never actually shown.
IMO, it was a good move not to make them too sympathetic and innocent but the writers went over the top (especially starting with BDtS). They showed them as the constant aggressors and therefore gave humanity too much of a moral high ground for the original premise of their narrative role to work.
And that's a shame because the original concept for the Batarians could have made for some superb story telling. I fear, even if they add a couple of "cool Batarians" now, it is too late to pick up that string and make it work. At best, we can now hope for a bit more nuance but I wouldn't expect them to salvage the original premise.