No hand is great preflop , even AJ suited. Ive lost with AJ suited vs 22 preflop all in.
anything preflop is crazy, if AJ doesnt hit and he raises, u gotta fold unless u can read the person or its low bet and u got draw. Holding AJ is like drawing, which can fail, yes its a great hand but if nothing comes ur screwed.
I would only all in AJ preflop if i was very high chipstack, or someone was low stack all in, or u can read the guy.