It seems like Draven is really strong, but I doubt it's because he's a Blademasters. The other ones seem weak imo, probably because they have to frontline. Running assassin's over Blademasters always seems better.
I would add Yasuo to the list of strong Blademasters. Setting him off to the side gives him a shield to start which allows him to get his rage built up. I think the problem is that you need at least 3 Blademasters to get the bonus attacks and I have not had much success with Blademasters beside Draven and Yasuo.
Draven is ridiculous I don't think I ever get the blademaster buff though Yasuo generally never comes up early enough for me to have space to incorporate him in Aatrox I'll sometimes add in but its more so to get the Demon buff with brand
