It is well received in /m/ without a doubt. But /m/ is significantly more friendly than /a/ by nature.
/v/ would seem to fit best since everything worth mentioning came from the games, but /brawl/ wouldn't stand for that.
And even ignoring the OVA of OG, the preceding games in the series draw directly from anime mechs. But does that make it /a/ material?
The catch-all of /jp/ might work, except that there'd be no audience among the TM and Touhou fanatics.