I believe that Azgroth is a beautiful one trick pony; He can take down great cards (who do not have power manipulation lower than his, or attack manipulation) at the cost of only having 4 damage and being weak to a lot of things (Lucy comes to mind, as does Dr Norton). Personally I wouldn't use him because he's that straightforward, but he works for some people. Dudley> Russel is just outclassed IMO. Pan creates a lifegap for 2 less and is nonconditional so he's pretty bad always. ALWAYS.
I didn't actually rate Russel high, but I thought he should be mentioned when you guys are actually discussing using Dudley Ld. In ELO. To be honest, only Oshitsune, Azgroth and Glorg are actually playable, and Magenta is almost but not quite.
Azgroth 's 8 power is crucial for Nightmare... of course if you go outside of clan, you can replace him with someone else like Elvis in that Nightmare/ Berzerk preset.
Azgroth isn't needed with Mefisto , Nistarok , Power Manip galore imo.
No one is going to feel threatened or overpill against Azgroth. Almost every time you play Azgroth they just let him through and you likely burnt a few pills on him.
Magenta is very playable, I've made it to 1300's with her multiple times, and she holds her weight.