Not quite correct. All we know about Mandalore during the Yuuzhan Vong war came from Traviss' LOTF books and her E-Novella Boba Fett: A practical Man, unless you want to count the small cameo Boba has in the final NJO book.
And no, he does have trouble with them. They even manage to slash his knee or leg, if I recall correctly. He does s laughter a bunch of Mandalorians in Invincible, but that was different book by a different author.
I agree, Tahiri is certainly not a top-tier Force User of the area but she's no push over either. She should be able to handle a few Mandalorians given the ordeals she went through. But her character got utterly butchered post NJO anyways, so who knows where Tahiri stands.
I concede that point. What annoyed me was the fact that suddenly everyone got scared of the Mandalorians. New technology or not, they were still pretty ravaged and had no real manpower. A few elite Commandos that can take on an army? Sure. Enough to wage a galactic wide war? No. But this is only a minor point.
I don't mind that. What I mind is the needless amount of Mandalorian that has nothing to do with the plot. I felt Bobas Wife plot was completely out of place and served no purpose at all. I feel the same about her Republic Commando novels. I absolutely loved the first one, the second was okay but after that it turned into a Mando Lovefest/Jedi bashing affair. On the other hand, I do agree she gets a lot of unjustified stick, like how Mara died. I felt that was handled perfectly well and don't quite understand the complaints.