personally, i don't like pride weapons either. at skill lv 20 though, they're pretty much 10% assault and give more as your HP drops (when someone has 5% HP left, they're getting 30% assault from that pride weapon alone if i remember right).
it's that situational effect that makes it seem kinda off to me (opposed to just getting a large assault and having it give a flat 16%), but it does help your general damage output regardless.
i honestly feel like you should only have one, but if you got blank slots or defenders that need replaced (like me), then have at it and get another MLB pride
plus i do think these get buffed later on, allowing you to get a 4th limit break so they not only hit skill lv 30 (and lv150 for normal stats), but gain a 2nd ability. so i'd at least hold onto them