Artics are mainly used on 35, 36, 54, 59, 60, 72, 160, and 161.
They've relieved most crowding issues on the 72 and 160. 36 is still the usual overcrowded loads despite at least 2 of 3 buses being artics on midday. 60 honestly does not need artics, the buses would've been better used for ensuring full artic service on the 36.
I don't see the 161 as much as before so I can't comment on that, although I may be in campus more come winter...
If anything the two problem routes at the moment are 75 and 162/170. 162/170 in particular you will never be on time and never not have standees unless you're lucky enough to have a 60 and 160 in front of you.