The effectiveness of an odachi, a type of Japanese longsword, depends on various factors, including its design, the skill of the wielder, and the specific context of its use. Here are some considerations regarding the odachi:

1. Length and Reach: The odachi is known for its exceptionally long blade, typically measuring over 90 centimeters (around 35 inches) in length. Its extended reach provides advantages in keeping opponents at a distance and delivering powerful cuts. The increased leverage from the long grip allows for sweeping strikes and potentially intimidating presence on the battlefield.
2. Cutting Power: The large size of the odachi blade grants it significant cutting power. With its long, single-edged blade and curved profile, the odachi can generate substantial force and deliver devastating cuts. It was historically used to target multiple opponents simultaneously or to break through armor.
3. Handling and Maneuverability: Due to its length, the odachi can be challenging to handle for the untrained or inexperienced wielder. It requires skill, strength, and precise control to effectively maneuver such a long and heavy sword. The size and weight of the odachi may limit its agility and restrict its use in confined spaces.
4. Historical Significance: The odachi holds historical significance in Japanese swordsmanship and warfare. It was associated with elite samurai warriors and was typically used in specific battlefield scenarios or ceremonial occasions. The odachi's presence and symbolism contributed to the samurai's prestige and displayed their status.

It's important to note that the odachi is a specialized weapon and may not be practical or suitable for all combat situations or personal preferences. Its size and weight make it less versatile and more specialized compared to other sword types.

Ultimately, the assessment of whether an odachi is "good" depends on the intended use, the wielder's skill and physical capabilities, and personal preferences regarding sword design and historical context.