The worst thing (more exaggerated in American English) is that English speakers attempt to both pronounce and conjugate those borrowed words as they are in the source language. Part of that is obviously the Germanic roots, where there aren't any regular conjugations, and plenty of the conjugations are arbitrary infixes - but listen to an English person say "valet" or "herb," or worse, the horror of "Nicaragua" and it's obvious that Americans do this more.
