Yea, Merlini is a fucking moron.
It's like no shit Medusa does a lot of damage 5 minutes earlier than for most "normal players". He didn't do that awful Linken's build which delays any meaningful damage by 5-10 minutes. He built damage-boosting items early and often and they couldn't do shit about it. That's how you play Dusa. Though I prefer a dom helm in there with yasha. Mostly because pubs can't be relied on for stacking.
But yea, build a fast yasha and aquila and you join team fights from 12 minutes on. It's how I've been playing Dusa for the last year to rather effective results.
Fuck Linken's, people. Yasha --> Bfly/Skadi --> Skadi/Bfly/MKB/Daed --> (whatever is left) and you'll win much more often than not.
edit:
not all wins, but the work done is almost always consistent. Even with teams of intentional feeders.
+1