Spider-Woman and Arachne are about 100% different from Spider-Man, beyond the spider themed name/look and general superhuman strength/durability/etc.
Spider-Woman (Jessica Drew) can fly, has the ability to fire venomous blasts (she's also immune to poisons) and has pheromones with which she can more or less mind control other people.
Arachne/Spider-Woman II/Madame Web II (Julia Carpenter) has a healing factor, a heightened sense of touch, can construct solid shapes via psionic energy (similar to Psylocke, but Julia's usually manifest themselves into webs), and, now as Madame Web, also has telepathy, telekinesis, clairvoyance, precognition, and astral projection.
As you can see, beyond the names, Spider-Man, Spider-Woman and Arachne are extremely different in how their powers work, and would also translate entirely different into the game.
You should rather complain about how many people use guns, swords and/or martial arts, because there's only so many sword users you can do and make them different enough.