Starters aren't used anymore, due to a speedy meta. Its only other use is as a SP-Counter, but generally there are better things out there, such as Mankey SV, Promocroak, Relcanth SV, etc.
I think it's decent, a good tech against SP's that, like Lou said, isn't bad to start with. It's also an easily searchable basic that requires no special energy (like relicanth/mankey/etc) and has reasonable HP for a non-SP basic.
Pachirisu is an amazing card, though Chatot GE has pretty much taken role as "that one usable tech starter" given the free retreat, 0 energy cost and ability to get rid of bad starts through Power Lock. Pachirisu is by far then next best Pokemon to use though. Chatot/Pachi/Absol are like the only Pokemon even worth considering for a starter.
As a whole, Pachi is an amazing card, escpially against Sp decks reliant on Energy Gain. But there just isn't any room for it in most decks.
Pachirisu is pretty good against Palkia Lock. 80 + removal of E-Gain and getting rid of all E-Gains in their hand... It's really good. However, if they get Azelf MT out with the other Pixies, it takes two energies, which kind of sucks. And in a lot of set-up decks, I'd rather be using Chatot's Mimic attack to set up rather than hold the Palkia Lock at bay for just a little while... Although Pachi is still great.