Thru milepost #56:

Losses (objective)

Award change fees (announcement snuck into promotional email)
Fee for Platinums to book close-in rewards
$25 partner award fee
Extra fees for overseas award origination ("international origination surcharge")
125% Platinum bonus ---> 100%
50% Silver bonus ---> 25%
20% increase for standard trans-Atlantic award (50,000 miles ---> 60,000 miles)
Elite availability dependent on the person (Platinum giving award trip to family or friend, availability now at general level instead of Platinum level)
Ability to upgrade domestic L/T/K fares with miles ("No forewarning and a deceitful change of the T&C's overnight! You can't even call this communication!")
practical ability to use mileage upgrades due to increased costs of internations B/M fares
Upgrades at gate for Gold companions
Upgrades at gate for Platinum companions not in the same PNR
Automatic PE companion upgrades 5 days before departure
Elite Extra Perks at 60,000 miles & 90,000 miles (now start at 100,000 miles)
Increases in miles required for awards
EQM bonus in Elite Extra Perks (unannounced stealth change)
WorldPerks VISA (AMEX accepted in far fewer places, plus AMEX arbitrarily curtailing credit lines)
4,000 & 6,000 miles award discounts from WorldPerks Visa
18-month expiration on miles (NW miles did not expire -- potential here for tremendous loss of good will)
NW Scoop & transparency
CO as a partner
Upgrades on KE using DL miles requires KE-codes Y fares (NW/DL B fares no longer need apply)

Losses (subjective)

"Ability to redeem our hardearned miles at any reasonable price"
"370k for a WBC trip to Asia is CRAZY when I can fly on my UA miles in F on SQ for much much less... "
"Difficult or impossible to book DL awards ex-anywhere except USA."
"Low or Perksaver Award availability seems to be much worse than before"
"award calendar that works"
"bogus SMU's that can't be used effectively"
"fee's fee's and more fee's ..."
"shakedown fees"
"watered-down, amost worthless Elite Extra Perks"
"frequent upgrades on low fares"
delta.com does not recognize NW status
delta.com does not allow NW elites to select preferred seats
lack of upfront notification of changes, especially negative changes -- we find out from others in FlyerTalk
"communication (or lack thereof) of these changes"
"lack of communications on top of the already negative changes"
"Poor info, such as incomplete Skyclub location lists, not mutually recognizing status on the other airline for upgrade issues, no published local airport changes and other plans, no info about BizPerks nor SkyBonus program integration"
"we simply can't rely on what was once a very reliable and respectful program to uphold the standard of service that kept me coming back"
"I too recognize that award programs need changes, but it's distasteful to stealth-change them mid-year."
"utter lack of stakeholder engagement, ... patronizing tenor of communications from DL SM team"
"SM has no, or a negative, impact on purchasing decisions because there is no added value"

Losses (uncertain)

MH awards using miles?
Ability to upgrade on KLM after this year using miles
Probably losing the 1K upgrade guarantee

Gains

Ability to upgrade international M fares with miles
SQ awards

Questionable changes (Most NW elites wouldn't consider these "gains")

Hard to use Delta PMU's (becomes a net loss once our Elite Extra Perks SWU's are gone)

Other losses (objective)

Hot food on flights < 1500 miles (Hello, Continental!)
Beverage service on flights < 250 miles (Hello, Southwest!)
F service to HNL reduced to standard domestic F service (Hello, Continental!)
Cognac on domestic flights
Fancy nut mix in F
Sale of lifetime WorldClub memberships
No more gate passes (typical money grab -- now have to rent rooms to meet transiting colleagues)
On-line booking functionality
Priority tags (expected)
Complimentary alcoholic drinks on trans-Atlantic flights

Other losses (subjective)

"simple web items that are still hosed... such as the SkyClub list"
"Moving toward the obviously inferior web site (DL) instead of NW's. How can this possibly be explained??? Even an idiot can see they must have decided for stupid reasons."
Huge increase in trans-Atlantic B fares
"intercontinental M/B fares went up drastically"
Confusion over SDC fees
$100 change fee now $150
"Good customer service"
"narrowness of BE seating, the lack of meaningful food in F etc."
"amaretto on the rocks in flight"
"bonus miles automatically posting to one's account with a letter of apology for the inconvenience due to mechanical delays"
"A Talk-to-Us process that actually responded to one's specific comments rather than a general cut and paste non-answer"
"Convenient flight options via DTW & MSP. Now I'm forced to do lots of CVG connections on barbie jets."
"The ability to pour your own beverage in the "Sky Club" - takes longer to get our beverages."
"Good snacks in Sky Club."
"The practice of tips in the Sky Club, thereby increasing our overall Sky Club expense."

Other gains (significant)

WiFi
150% EQM's for M fares (note that this followed a massive protest after Delta tried to reduce EQM's for M/B/Y fares to 100%; this is also tempered by increased costs of MBY fares)
Snack/fruit basket in DL F
Snacks (peanuts) in NW Y

Other gains ("whoopee"):

WBC soft product (pillows, duvets)
Pillows & blankets back in F
Bottled water in FC
Funky mixed drinks
Biscoffs
New uniforms
Coke