According to
Certain Affinity themselves, at the time of Halo 4's release, "Every single product 343 has released to date, if we haven't been the sole developer then we've been the co-developer". Eurogamer was keen to paint CA as the "un-sung hero" of Halo 4, and credits them with developing an enormous amount of the multiplayer component in particular.
For Halo 2 Anniversary, CA was tasked with updating the Halo 2 multiplayer as part of the Anniversary package. The blueprint of the gameplay was already there, so the amount of kudos I pay to them there is limited.
At the time of the Doom 2016 beta, I called the multiplayer "the worst case scenario" and suggested cutting the entire feature. I stand by that assessment - especially having since played the single player campaign, to which the multiplayer feels very alien. It's not just a bad Doom game, it was a bad COD-clone in the same way that Halo 4's multiplayer was a bad COD-clone. Halo 4 was wisely altered by 343i post-launch, but the damage had already been done. Doom 2016 was wisely abandoned.
As for the rest, as I said, CA's output ranges from great to bad. Some of their maps have been the highlights of their respective games. Some of their maps have been less so. However, no one can doubt the quality of their art. In particular, the range that their artists are capable of is incredibly impressive; seamlessly integrated into the franchises they've worked on. If you didn't know their work had been outsourced, you wouldn't figure it out on your own. A true testament to their talent.