Is there any legitimate reason to have the Assassin just be a clone of the Rollcage missile, other than for the sake of nostalgia?
GRIP can make the Assassin cool to use standing on its own without being a copy-paste job.
The cars can go March 1 and the Assassin is faster in order to catch them, so we should be seeing and hearing a supersonic shockwave to really set the missile apart from the Scorpion other than being "the blue missile". Seeing a supersonic cone on the missile in UE4 would look kickass and the shockwave could shake the screen after the missile passes you. So you really feel it that this is a really powerful weapon, and a class above the rest.
For a name like "The Assassin" I think being able to see it coming for miles defeats the purpose imo. Keep the HUD warning of "Assassin Inbound" but add on the fact that the Assassin accelerates over time from transonic to supersonic and maybe even hypersonic at maximum distance so the window of time to react is narrower and narrower. The further distance away from the leader that the Assassin is launched the greater speed and damage done by the sheer velocity increase. The Assassin just feels like an annoyance right now, without being able to DNF, and doesnt even take someone out in a full load like the Stinger.
Additionally it should be a bigger threat and do something about the Assassin spam so it's more rare. When it's launched it should be feared, not only taking out the shield but also doing damage because Aegis shouldnt be able to totally negate it like it does with Scorpions, just soften the blow.