I realize I'm probably going to be in the minority here, but for me, Smith's era has held up the best of all the NuWho Doctors. It lacks RTD's proto-SocJus bullshit and habit of pulling plot resolutions right the fuck out of nowhere, Amy and Rory have a pretty good dynamic with the Doctor, and it's overall pretty consistent in quality terms, with the bad episodes mostly just being boring and forgettable rather than anything to piss you off. Aside from maybe "Victory of the Daleks", but even that would probably have worked a lot better if it had been a two-parter.
As for Smith himself... eh, he's okay. Not in the same league as Eccleston, Tennant, or Capaldi, but he carries the show well enough.