The thresher is garbage for anything except a support role/group fighting. Low powercore low armor it doesn't even turn that fast. What saves it is its slim profile.
Bottlenose has the same story its slim profile is what makes it decent in group fights. It's fast but it's armor is super low.
Orca is large, slow, arcs are bad. FG doesn't deal enough damage its garbage.
You already said the mako was bad. Which is true.
Bullhead is the one ship in the core capline I like. It's not op but it is good. It's thin profile and arcs make it good but it's turn rate is so slow.