Honestly, with the way seemingly every at-large hopeful blew their chances in the final few days, it's hard to describe anyone as a true snub, but a handful of teams with arguments got left out.
Here's why the selection committee probably chose to look elsewhere (teams listed alphabetically):
Alabama (20-11, 11-5; RPI: 60, SOS: 76)
The Crimson Tide dug themselves too big a hole with poor nonconference losses and apparently needed to beat Florida (at least) to get in. Four sub-150 losses were too much to overcome, especially with two at home.
GW: Villanova (N), Kentucky?, Tennessee (N)?
BL: Mercer, Tulane, at Auburn, at LSU
Iowa (21-12, 9-9; RPI: 79, SOS: 101)
The Hawkeyes didn't schedule great in nonconference play and then whiffed on all six chances they had for a top-25 win. Seven of their 10 league wins, including the Big Ten tournament, were over Northwestern, Purdue, Nebraska and Penn State.
GW: Wisconsin, Minnesota, Iowa State?
BL: At Virginia Tech, at Purdue?, at Nebraska
Kentucky (21-11, 12-6; RPI: 57, SOS: 70)
The Wildcats' season changed when Nerlens Noel went down, and while the Cats beat Florida and Missouri at home after that, they looked terrible in all four games away from Rupp, including a lopsided loss to Vanderbilt in the SEC quarterfinals.
GW: Florida, Missouri, Maryland (N)?, at Ole Miss
BL: at Georgia; Vanderbilt (N), at Tennessee by 30 w/o Noel* (in case of bubble tiebreaker)
Maryland (22-11, 8-10; RPI: 66, SOS: 91)
The Terrapins had two wins over Duke (including one with Ryan Kelly playing) and a third quality win over NC State, but that's really it. The nonconference schedule was terrible and they paid. Only 4-9 vs. the top 100.
GW: Duke 2x (home and neutral), NC State
BL: At Boston College
Massachusetts (21-10, 9-7; RPI: 55, SOS: 72)
A pretty milquetoast profile -- not too much right or terribly wrong -- that apparently didn't impress the committee. They're one of a large bunch of teams that needed one more win in the conference tournaments and couldn't get it.
GW: Temple (N), at La Salle?
BL: George Washington, at St. Bonaventure
Tennessee (20-12, 11-7; RPI: 59, SOS: 58)
The Vols have no one to blame after dumping their SEC quarterfinal to Alabama. They were 4-4 vs. top 50 (with some very solid wins) and 8-10 vs. top 100, but almost all of their good work came at home. Tennessee was 2-9 vs. top-200 teams road/neutral.
GW: Florida, Missouri, Wichita State, UMass (N)?, Kentucky?
Virginia (21-11, 11-7; RPI: 77, SOS: 118)
A good team with good wins but way too many bad losses, even if you gave it credit for injuries. The Cavs went 8-4 vs. the top 100, but losing on the road at four of the five worst ACC teams killed their claim.
GW: Duke, at Wisconsin, NC State, North Carolina, at Maryland?BL: