Checked out Primark today. As expected, it's pretty down-market and somewhat drab (to my eye...maybe it's an aesthetic for younger folk). It didn't seem trendy to me--too Portland-hipster-on-the-cheap. A bit as if Walmart marketing was run by IKEA... Not entirely bad: easy to stock up on underwear, socks, tee-shirts etc. Everything seems very disposable, but as others have noted, that's the point.
What I think is interesting, however, was the juxtaposition of Primark to MT. A more extreme version of the City Target in the middle of this aspiringly high-rent part of Fenway. In both cases, but especially in the former, it seems odd that people living $1M+ condos would want to be in a building anchored by such a low-end retailer. Again, the Fenway contrast isn't as stark (Target not that bad, VanNess not that upscale) but it still strikes me as an odd couple. The costly residences in the towers being built on Dalton and atop the Copley mall seem more in line with what I'd expect.