I personally never claimed to have an understanding of the show, as a whole. In fact, I clearly stated that my own experience of the show lasted all of two episodes. The problem is, though, those two episodes are highly flawed and open to very legitimate criticism. Personally, I saw nothing in those episodes that even suggested a more mature approach to the series and, furthermore, I thought the premise was decidedly juvenile and silly (if not downright exploitative). As such, chose not to give it my time. Based on that, all I said regarding its cancellation was "there's little surprise or remorse for this news."
The unfortunate (or fortunate) thing with Dollhouse is that things aren't as they seem to be - first impressions are always a lie. It's all about the pieces of the puzzles falling together at the right moment. For example after seeing Vows and then feeling inspired to rewatch the series from beginning I saw Ghost from a completely different angle. There are so many subtle cues and hints in Ghost already. All the self-loathing, pain and regret when Topher looks at Whiskey is already in the first episode, Echo's first signs of awareness - of her true being are there, scenes start to mean something completely else and everything was an a-ha moment. So when I watch the first episodes again I'm all amazed how carefully planned it was.
However for one to start seeing the continous substory a more wholesome experience with Dollhouse is needed. The obvious parts of first episodes did consist of very familiar scenarios seen from various procedural shows, but the obvious was a lie.
I'm guessing that Dollhouse wanted to create this down the rabbit hole experience - you start with something and you think this is what this is all about, and then after several episodes you discover that it wasn't at all about things you thought it was, then rationalizing it you say the show changed direction, but then rewatching it all you discover it was all there in the beginning. When I say "you" I mean me and I'm just giving a narrative of my own experience here.
What I'm saying is that unfortunately or fortunately, Dollhouse is a puzzle show that doesn't do stand-alone episodes. There's always something underneath. It's like made by Jesus if you love putting pieces together and discovering new meanings.
So I'm going to assume that the juvenile immature scenario you refer to is Dollhouse 1x02, where a guy hires Echo so he could sleep with her and then kill her. It's like a typical "violate the women" pg-13 rated teen crappy slasher film thingy, right? But that whole situation was orchestrated by Alpha who wants Echo to become who she really is. There was a similar idea in Firefly - it's about throwing people down the volcano, so you could know who they really are. As in, the true nature of one is revealed under torture. However Alpha doesn't want to know who Echo is, he thinks he knows who Echo is. He wants Echo to know who she is. So he creates situations for her where she has to go down to her instincts, her deepest core. Alpha hopes Echo will become like he is - a natural born killer. Alpha is lonely and wants a Queen at his side. However Echo, reaching that awakening after Alpha forced her, chooses a different path. She starts to notice that all the people around her are broken - both the dolls and the dollmasters, prisoners and prison guards. So she starts hugging people all the time so they could be their best, while secretly searching for a way to bring down the world that keeps breaking her people. She's like Moses "let my people go!" and everything. Moses didn't start as Moses. The first episodes are like Moses as an egiptian law official, and then you think this is somekinda weird egyptian lawyer show, but no it's not, it's a continous journey which ends with Moses becoming Moses. I'm rambling.
tl;dr - I disagree with you. I guess, since I don't remember anymore what you said exactly. Sorry. It took me an hour to write this.