Hm... Due to the stellar income in v.0.200 and later versions I've got a chance to try every weapon I wanted. So, yesterday I bought myself a katana. So, in v.0.201 I find katana to be the easiest 2h mode ever. In 99% of cases all you have to do is spam everyone to death with some occasional blocking. Yes, katana is pretty expensive, basically I used it with my peasant gear (linen shirt and so on, since in order to get a good income I try to keep my gear under 10k), BUT my combat efficiency did not suffer from my crappy armor at all! Seriously, why should I bother wearing armor if my opponent simply does not have a single chance to hit me? By the way, I've got a pretty balanced 2h build (18-18 Strategus-aimed character with 6 ps and 140 wpf in 2h), and even with 18 agi and a proper footwork I had to block every third swing (swing-swing-swing-block-swing-swing-swing-block-...), while my powerstrike combined with chadz's maintenance system allowed me to kill anyone in 2-3 hits. Agi-intensive builds with 150-160 wpfs would be even more successful in spamming this little thing.
Summary: katana speed should be decreased, since currently it's nothing but a spamming uber-machine.