Well this show is still fresh and new, so it hasn't had enough to time get crappy. I haven't seen Weeds but I thoroughly enjoyed OITNB and spent one week burning through it.
Weeds was an incredibly flawed show, but I still retain some modicum of respect for it, as it paved the way for a lot of great things (namely Breaking Bad). Season 2 in particular is an utter masterpiece, and I'm personally partial to season 4 despite the general consensus on it. Ultimately though, the show lost focus far too soon in its run, and every time it appeared to be going somewhere, it would eventually prove to be completely aimless. It's a shame too, because the ending of season 6 would've been a perfect place to wrap it up while still retaining some semblance of credibility, but then it continued for a further two seasons which were fucking abymsal.
I'm very, very curious to check out Orange is the New Black, though. Female prisons in particular have been a very unmined subject source for television, outside of Cinemax sexploitation flicks and the scrapped Prison Break spin-off Cherry Hill. The critical acclaim I've seen for this show has gotten my hopes pretty high, regardless of my opinions on Kohan.