Mr. Tines: "I was expecting an Earth-shattering KABOOM!" This is a fairly anti-climactic end for an Angel.
UrsusArctos: As far as Angels go, Matarael seems to be a third-rate jobber (unless it has other abilities we never get to see). It's the only one to be turned into a sieve by a plain vanilla pallet rifle, and we don't even get to see Nerv dispose of the corpse like we did with Ramiel.
Dr. Nick: Matarael was too smart for its own good. But the pilots were also lucky because the Angel was apparently constantly synthesizing its acid instead of having some sort of giant bladder full of it, as there was no gigantic acid flood when its body got perforated.