Doesn't matter, it's a kick ass trick.
Lacks firepower? He has a massive scythe that he can chase people with.
unless you happen to be 8 gates or SM/BM you're not going to out taijutsu him, he was pushing back kakashi.
He
solo'd
the
2
tails
in
bijuu
mode.
That is impressive.
His only move his deadly but the preps have to happen. Offensive jutsus are suppose to hurt or kill, doesn't mean they hit or work cause they don't 95% of the timem (assuming he isn't fighting someone in coma that can't move or defend itself).
A relatively big weapon (in this case a scythe) isn't great firepower... 0_0
Specially when its not intended to mortally wound but draw even the slightest amount of blood.
For instance, his partner Kakuzu has something we can consider great firepower: the masks massive AoE elemental burst.
He's effective against taijutsu users or other guys who lack firepower to put him down (cause immortality), yes, but if they have intel he becomes more or less useless due to having only ONE ability.
About the 2-tails, it was never stated that he soloed Yugito, he gave the 'finishing' blow but IIRC the fight happened off screen and Kakuzu was there too.