Well sng wiz will help if you want specific numbers
Or... estimate the calling ranges, pokerstove a2o vs. those and see what equity you have.
compare that to 22, JTs, 76s, T9o, A2s, etc (let alone stronger hands, these are just examples of "lighter" hands that you can push) and maybe you will see why a2o sux
don't get me wrong, a2o is a snap shove in some spots but here there are a few guys to act behind, a few which are deeper (15bb effective). this hand just doesn't play well vs. tightish ranges.