Level 51 in hell act 3 is (very) low, especially if you're a hybrid (lightning/poison). I solo'd hell a3 on a mageazon untwinked at around level 70, so it's definitely possible. If you have gear you can go for physical damage, of course. You could probably do it as pure lightning at a reasonable level, but would probably need to distract most immunes and run past them with decoy/valk.

many u stay in Nightmare until u are level 60 ore highter. Maby a good Bow-Amazon can handle Hell. Maby slow but it must be possible with higher level and with skills made well.