Good Or Bad Call (Pot Odds) Hand #2

[Desdia72]

in my last hand post with K K vs A 3, i was told that the guy did'nt have the pot odds to call, much less play the hand in the first place. in example hand #1, me and my opponent had close to the same amount in chips. in this example, i am the shortsack with the better hand preflop getting called by the big stack with, whadda know, a weaker hand. so, is this a good call based on pot odds and if so, why in this instance? i'm thinking this may not be a pot odds issue since it was an all-in, but i could be wrong.

PokerStars Game #635667546: Tournament #2435690, Hold'em No Limit -
Level VI (100/200) - 2004/08/22 - 21:57:44 (ET)
Table '2435690 1' Seat #8 is the button
Seat 1: canubeataaaa (5425 in chips)
Seat 4: mojoman_x (3245 in chips)
Seat 9: Tallftwtexan (1360 in chips)
Seat 6: brilynnel (2630 in chips)
Seat 8: Desdia72 (840 in chips)
Tallftwtexan: posts small blind 100
canubeataaaa: posts big blind 200
*** HOLE CARDS ***
Dealt to Desdia72 [Ac 7d]
mojoman_x: folds
brilynnel: folds
Desdia72: raises 640 to 840 and is all-in
Tallftwtexan: folds
canubeataaaa: calls 640
*** FLOP *** [9h 4d 6c]
*** TURN *** [9h 4d 6c] [3c]
*** RIVER *** [9h 4d 6c 3c] [6s]
canubeataaaa said, "nh"
canubeataaaa said, "gg"
*** SHOW DOWN ***
canubeataaaa: shows [5s 7s] (a straight, Three to Seven)
Desdia72: shows [Ac 7d] (a pair of Sixes)
canubeataaaa collected 1780 from pot
brilynnel said, "nh"
*** SUMMARY ***
Total pot 1780 | Rake 0
Board [9h 4d 6c 3c 6s]
Seat 1: canubeataaaa (big blind) showed [5s 7s] and won (1780) with a
straight, Three to Seven
Seat 4: mojoman_x folded before Flop (didn't bet)
Seat 9: Tallftwtexan (small blind) folded before Flop
Seat 6: brilynnel folded before Flop (didn't bet)
Seat 8: Desdia72 (button) showed [Ac 7d] and lost with a pair of Sixes

[durron597]

He's calling 640 into an 1140 pot, or 1.78:1; so he's getting borderline pot odds (not really), but even if he assumes that you don't have an overpair (a good assumption) or a 5 or a 7 (another pretty likely assumption), he can excuse the call by saying that he wants to bust you for $EV reasons. I disagree with the call but I think it's close enough that I just say "disagree" instead of "the call was awful"; making calls like this is how big stacks let shortstacks back into the game.

By the way, making a call like this is how Howard Lederer came back from nothing when Gus Hansen made a borderline pot odds call to Howard's allin in PSI.