I'm still enjoying it. I like the episodes that open with the conclusion (or aftermath) of their
last case. These glimpses of strange stories like the one in the zoo are fun, and let the writers just throw out wild ideas that might not work as full episodes, but are intriguing as teasers. (Reminds me of Watson's habit of referring to his notes on cases that Sherlock Holmes solved that he never got around to writing up as full stories, like "The Giant Rat of Sumatra".

)
The chemistry still works for me, the backstory is getting filled in, Claudia is an interesting addition to the mix, and I don't really see their logically following clues to the key to the artifacts (as they clearly did in the case of the compass) to be examples of
deus ex machina, unless the meaning of that term has changed in recent years. "Elements" was a lot of fun, although it was pretty obvious that the first artifact was a cloak or other garment, probably Native American, as soon as the feather was discovered. (Nitpick: As Pete rightly notes, artifacts usually require human contact to work. So it should have been impossible for someone to remove it from the wall with a gloved hand.)
Regards,
Joe