i actually agree with that poor Nero, but both Artoria and Archimedes are independent servants so they join at some point. Though Nero does have Nameless who can match and beat Gil as well as the other servants on her team are all very good servants.
Nameless may not be able to beat Gil in this iteration since this Gil is "Not-Looking-Down-On-Enemies" Gil, meaning he actually can and will wreck everything with Ea.
Ah thats right i forgot that Though Nameless is also able to pull off Excalibur in the iteration with a bit more ease. about the only advantage i see for Nero is that her team seems to be the least likely to imploded do to disagreements.