As much as I hate seeing this thread, allow me to dispel the notion of Isaac being 'Generic' and continue Cyber's previous point about Isaac's potential.
Can (pick up a boulder) create energy hands capable of moving objects or people with (Relative) ease?
Move Psynergy. Thanks to Brawl, I'd probably say that anyone who's played it will associate this with Isaac.
Makes earthquakes that can shoot people into the air?
We don't have any character in Smash that manipulates the earth itself. That is in itself, a unique feature Isaac can bring to Smash Bros.
Drop (Crushing rocks) on his opponents seem such a breeze?
Shoot vines out of the ground and ensnare his opponents?
He may not need his sword, he can wield an ax, this Golden Son, is a worthy Smash Bros Candidate!!
Like I said above, I'm beginning to hate this thread more and more. This chain of anti-Isaac propaganda grinds my gears, given he's one of my most wanted. I'd argue if K. Rool wasn't number one in my wish list, it'd be Isaac who'd be number 1.
Bottom line - Isaac does not need a sword to be Isaac. His Venus Psynergy does it for him.
And another thing - Isaac can also rely on other types of Psynergy - Wind (Jupiter Psynergy) Fire (Mars Psynergy) Water (Mercury Psynergy) He could blend skills like Planet Diver or Astral Blast into his moveset!