Yep, dachshunds are good ratters. In fact, I think that is why so many pet daschunds are “high strung” and jumpy, nippy little things. They were meant to be worked daily to burn off all that energy, but when kept as lap dogs they have no outlet for it.
We have had nothing but dachshunds for the last 32 years. Although I know what you are talking about, none of ours have been like that. I have seen that more in dachshunds that have been bred with Chihuahuas or other toy breeds. Ours have been sturdy little guys with big chests that were afraid of almost nothing.