FactorList2[exp] is similar to FactorList except that it correctly handles symbolic exponents.
FactorList2[(x[1] x[2] + x[1] x[3] + x[2] x[3])^(-3 + 3 ep)/(x[1]^2 x[2] + x[1]^2 x[3])^(-1 + 2 ep)]\left( \begin{array}{cc} 1 & 1 \\ x(1)^2 (x(2)+x(3)) & -2 \;\text{ep} \\ x(1) x(2)+x(3) x(2)+x(1) x(3) & 3 (\text{ep}-1) \\ x(1) & 2 \\ x(2)+x(3) & 1 \\ \end{array} \right)