It is leaking from the bottom, but where on the bottom? Often pumps leak after years of neglect: no fluid and filter change.
It is my experience that these pumps are generally no worse than other MBZ pumps.
If it is a bad pump, get a rebuilt one from a quality supplier. Best bang for the buck.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)