An avid player that has yet to memorize the weakness type (which never changes) for each race...? Hell there are only 4...
Fallen - Arc
Vex - Void
Hive - Solar
Cabal - Solar (however I've seen sion's using a void shield in the nightfall)
English
-
That's not accurate. It varies enemy to enemy within a race.
-
Enemy shield types rotate on higher level missions. Example, Hive Knights will have arc shields. Fallen Shanks will have Solar. Etc.