4NL Is this allin write or rong?

If no one else will then I'll have a go.
Of course, this situation is slightly different because it is Hero who goes all-in rather than being faced with the decision as to whether or not to call an all-in from someone else.

First, what sort of range can we put our villains on?
Since we haven't got any reads on them let's just take a standard strategy and go for JJ+ and AKs for the SB and add AQs, TT and AK for UTG+1. After all, we have no reason to assume that they are any more or less capable than we are even if the SB seems to be a bit short.

So, over to our friend Pokerstove to see what sort of equity we might have.
And the answer is:
Hero has about 14%
SB has about 48%.
UTG+1 has about 37%

Hero goes all-in for $3.48 and by the time everyone has finished calling the pot is $8.72.

Then we have the following:
EV = (.14)(8.72) - (..86)(3.48) = 1.22 - 2.99 = -$1.77

So going all-in was -EV.

Of course, I might be completely wrong as well.