Is it wise to use this Brave Ike

tl;dr Brave Ike is Brave Ike. 33 Atk instead of 36 hurts but does not kill Brave Ike. Use him unless he has no place on your team, in which case no IV would have saved him anyways because he relies so little on them.

Don't look at him like -Atk, +HP Bad IV. Think of him like this:

This is a unit with an HP/Atk/Spd/Def/Res spread of: 46/33/28/35/20. He can be rarely 1-shot by red mages, but will tank physical units with usual ease.
He has a Killer effect. He can proc Aether in one round with QR without being doubled, so he essentially has Radiant Aether, Radiant Ignis, Radiant fucking Galeforce if you wish.
He has Deflect Everything 3, so he neuters Brave users to the point of being barely threatening.
He can, if he wishes to, to cancel out any and all horse and flier emblem buffs vs. him.

Will you still use the unit? Does his now 33 Atk make or break the deal for you? Is 33 Attack so bad that it removes his place on your team, or makes it less valuable than Steady Breath Aether spam on *insert dragon here*?

I know the lost potential of -Atk is hurting, but it's honestly ridiculous to seriously consider kill a unit solely over it, unless that unit was: a) low on Attack, which he isn't, b) A Brave/Heavy Blade user, which he isn't, or c) An already suffering unit, which he... lol.

Use him depending solely on your current pool of greens and arguably blues. His value is independent of whether or not he has good IVs, but rather whether or not he is useful to your current roster with 46 HP, 33 Atk and his above merits.

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It’s not a solid spread, but he’s a good unit. If it’s your first one, I’d say keep him and build him. I have a neutral Brave Ike and he’s pretty strong in AA.

-Atk doesn't matter when you're going to Aether is going to be doing most of the work on retaliation anyways, and you'll rarely rarely initiate enough for 3 extra atk to matter. The extra bulk you're getting on him is good enough.

Of course if you can find a better one take that one, but these IVs aren't the worst.