While it could certainly be articulated and argued that the Trapdoor had its short comings as a combat weapon, it was and is unquestionably a very historic rifle that came about and was issued during a fascinating time in American history. I will certainly look up that book as it sounds like a great read, but it won’t change my mind in wanting one to complete my US 1860 and 1870s collection!
You should read The Trap-Door Springfield in The Service by Col. Philip M. Shockley (1958). You might change your mind.
"(The Trap-Door Springfield) is a monument to the fixed idiocy of the War Department. No titles of esteem or affection were ever bestowed upon it."
- Col. Shockley