I think we all know what to expect from the Whirlwind, it's an airframe introduced in 1940 and not developed any further, so it will certainly struggle in the LWMA.
If you mean it won't be the ride of choice for runners, you're right. It will also "struggle" in that the ammo count will mean those with poor aim will be bingo sooner rather than later.
Beyond that, I don't see it "struggling" any more than the Brewster, Ki-43, or Hurri IIc. Excellent turning ability, excellent low speed handling, deadly lethal cannon package, great views, robust airframe with twin engine survivability.... think of it as a small, slower Mossie that turns like a Brewster.
It will be a challenging aircraft in the LWMA, and you won't see many of the "avoid a fight at all costs" flyers in them.
I'm totally OK with that.