This is a very easy fold in my opinion. First of all, most shoves are gonna be broadway cards, or decent pairs. If the villain shoves with two broadways, you lose if either one connects with the flop. If they have one broadway, that one can connect also. If they have pair, it is a toss-up as to who draws a set. TT is beaten most of the time in shove matches. If you already noticed that villain shoving with uncoordinated cards, then sure, call it off. I had it happen to me, where the guy ahead of me was shoving every hand. I saw a 64o and 89s when I got to see hands. Next time I had 99, I called, took him down. I would not have used 99 to call an all-in without knowing the player first. AA and KK are much better at calling all-ins, but even then those can be beat. I just called an all-in (all-in villain was in CO) in SB with KK, and the BB also came behind me with another all-in. CO had A6s, I had KK, BB had QJs. After all the cards came out, my hand was still KK, CO had AA, and BB had a flush. My KK was beaten by both of them. That being said, KK still beats all-ins most of the time so it is profitable, TT is not.