That's a flaw in the pilot though. Manoeverability I can understand, at least in the hands of humans using suboptimal controls, but 'too much speed' can be solved by shunting some more power to shields or simply not flying at full throttle...
Regarding improvement: Volition generally avoided having one craft be strictly superior to another. Apollo/Perseus and Hercules/Ares might come close enough that there is no reason to pick the older craft in practice though. Unable to carry real bombs, the Athena was essentially an assault fighter with a focus on secondaries, and I'd say the true successor in spirit is the Hercules Mk II (Trebuchets do the job of disabling subsystems just as well as Stilettos).
While the Athena had advantages that made her more pleasant to fly (even better gun placements, more endurance on afterburners) I'd say the Herc II is generally the stronger craft.
Regarding 'fodder' craft: How well the AI performs in a given craft doesn't necessarily reflect how good it is in the hands of a human pilot. I for one never understood why the AI seemed to do decently in a Ulysses when they otherwise suck in light craft (I still think that the Scorpion and Loki* are the ultimate dogfighters of their respective factions; as AI-controlled opponents they tend to die quickly though). On the other hand, the AI's use of fighter suppression missiles is more competent than my own.
*when having unrestricted access to weapons at least