So, figured out that hotkeys will assign automatically if you select the character and restart the game (on PC at least).
That said, Sentinel is overpowered and fun as hell. Infiltrator is my second favorite class. Love cryofreeze spamming everything. Soldier is a pussy for the most part. Not that fun to play. Haven't played vanguard or adept. Engineer is sort of weak it seems. Turret is not that good, although I haven't really leveled it.
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