Lazy? No.
Underwhelming performance in a number of aspects? Yes.
Lots of people blame EA or think Bio has started to rot from within. I don’t think so. Sure, a lot of people left and the company culture almost certainly changed – and will continue to change. But that’s how it is. In the end I believe they remain a large, well-funded studio filled by hardworking people with lots of experience between them, and at least a modicum of creativity (question is of course: how much creativity is allowed?).
Like the Crusty Chevalier, I don’t think BioWare excel at design or worldbuilding. The Baldur’s Gate games and KotOR gave them extensive universes to play with, but at the same time these were IP’s watched over by zealous guardians. BioWare was allowed to use them, but they were prevented from screwing things up. This is a kind of situation that actually hinders a disciplined and highly creative team who are able and willing to create their own systems and world, but if that kind of talent and / or discipline isn’t over-abundant, being limited is actually a blessing in disguise. If you look carefully at Jade Empire, the first IP of their own making, the game’s setting was unusual mainly because cRPG’s in non-standard American-style D&D-ish quasi-medieval European worlds are so rare. At the time, it was a pretty (but rather short and linear) game featuring so-so-gameplay and a setting that can only be described as a generic East Asian martial arts movie / fantasy schlock mish-mash. Refreshing because of its relative unicity, but not exactly the greatest fantasy IP evar.
Still, BioWare gets brownie points from me for having the guts to do a non-standard fantasy cRPG.
Mass Effect and Dragon Age have the same problems. They were both clearly designed to be generic and mainstream within their respective genres. DA inverts some fantasy tropes, but this does not make the DA world less generic; just somewhat refreshing, at least in the beginning until you realise that this is largely it in terms of creative worldbuilding.
My first reaction playing DA and ME was ‘well, it’s generic but it has some potential for future development’. Then along came DA2, DA:I, ME2 and ME3. These days, I would scratch everything after ‘it’s generic’ and add ‘and a mess’.
In the end I am not sure if it’s the absence of talent, ability, experience or however you want to call it. That may be part of the problem, but it may also have something to do how BioWare as a studio evolved, how they work and where they work. As a whole, I would say they are rather conservative / derivative and unimaginative when it comes to their worldbuilding, but they do like to play around with their gameplay mechanics. Unfortunately, as others have remarked, they tend to try and then scrap the more interesting and unique things in their games.