when do you fold medium pairs PF?

[taipan168]

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Here's a similar example, so this is always a fold? Or do you fold this preflop?

Poker Stars, $6 + $0.50 NL Hold'em Tournament, 100/200 Blinds, 7 Players
LeggoPoker.com - Hand History Converter

BB: 1,135
Hero (UTG): 1,545
UTG+1: 1,725
MP: 1,580
CO: 700
BTN: 4,950
SB: 1,865

Pre-Flop: (300) 9[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] dealt to Hero (UTG)
<font color="red">Hero raises to 500</font>, UTG+1 folds, <font color="red">MP raises to 1,580 and is All-In</font>

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I just open shove this preflop with &lt;10x BB. Raising 1/3 of your stack then even thinking about folding to a push is really bad.