- Placid Platypus
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- Exalted Legendary Member
For Carnage Apply Within - Fatum Iustum Stultorum
"Do not mistake your rank and number for superiority. The oldest child may learn from the youngest."
Seems like a simple enough decision to me. If you want the maps now, buy them. If you don't mind waiting and are already planning on shelling out the $60 for ODST, I'd advise you to hold off.
Like a few of the other users here, I got the maps with the limited edition of Halo Wars so I didn't have to play for them separately. I enjoy the first of the three Mythic maps and find them to offer varying amounts of fun (both in matchmaking and in forge), but don't feel they are worth $10/800MS points. If I hadn't picked up the maps from Halo Wars, I most likely would have waited for ODST given for the same price as any other new game I'll get the full version of ODST and all of the Halo 3 maps at no extra charge. As such, I'd advise those without the maps to wait until ODST drops to pick them up (only 2 months, two weeks, and five days).