Well from personal first had exp with using melee weapons, the katana is extremely overrated. Its power comes from its speed without question, with the premise of death by a thousand tiny cuts. The katana is a phenominal weapon to make cuts and gashes into soft material.
The problem with the Katana is how much percision is required to use it effectively. You basically have to make your first shot a kill shot for the most part, and it has to be in soft flesh, which honestly is not hard to accomplish if you slice through the throat or the lower abdomen below the ribcage. However as soon as you encounter something hard like bone you quickly see the failings of the katana.
Honestly it does not take much to bend, break or dull a katana. So you might be able to repel a few weapon on weapon strikes and perhaps lacerate an arm your not going to get much more than that out of it. You might get one kill out of it, but if your fighting multiple opponents your pretty well boned.
Heavier and thicker blades have a much better durability. A weapon such as a gladius/cestus operates on the same hiltless speed based design, but will likely be able to endure many more strikes, be it against a shield, a thick bone, or a miss that hits rock/concrete/wood and still be able to continue on, all the while still retaining the same sort of deadly speed the katana is known for.
Its a nice weapon for its purpose, and they certainly do look beautiful, but practical, no, not really. Deserving of its hype, absolutely not.