Actually strength-oriented 1h are quite good for duelling (24-18 for example).
Overall in battle 2h and shielder are equially effective, but you need to adapt your playstyle to your class:
as a shielder you want to be in the clusterfuck fighting like 10 vs 10, and as 2h I believe you should be looking for small group fights like 3 vs 3 or duels.