The MV-22 Osprey is a CH-46 Sea Knight replacement, NOT a CH-47 Chinook replacement.

Please remember the -46 has about 70% of the volume and less than half the cargo lift of a -47.
CH-46D = 25 pax or 2,272 kg internal cargo (3,175 kg total)
CH-47A = 33 pax & 2,720 kg internal (and up to 5,900 kg external)
CH-47D = 6,300 kg internal (10,340 kg external).
CH-47F (CH-47SD) = 12,700 kg on center sling hook or 9,070 kg (18,140 kg total) on each of the two end hooks (fore/aft).

The Osprey's internal cabin & payload are right where the Sea Knight's are... as designed!

And speaking of Sea Knight replacements:

http://web.newsguy.com/sather/helo/Boeing360.jpg

http://www.aviastar.org/helicopters_eng/boeing-360.php

Design goal was 200 kt max cruise, and to do the CH-46 mission at a gross weight that was 3,000 pounds less than the empty weight of the V-22.

:{:{:{:{:{:{:{ :mad:!

Speed Counts
 

It's not JUST a CH-46 replacement. If you only think of it in terms of a single wave, you're right that the heavy kit can't keep up. But once you start doing really big STOM stuff, it means you can get twice as many men on to the ground in the same time in multiple waves than you could with CH46. And in any case, having some slow aircraft doesn't mean you should never get any fast ones!