how to know if you're playing well

[Dr1Gonzo]

Just wondering how you can measure if you're playing well when you're down at a certain level.
I realise this is probably not many hands to go on but I have played
-: 1,500 hands at $0.5/$1 and was +6BB/100
-: 1,500 hands at $1/$2 and am -3BB/100

I think I'm playing okay at the higher level but I can't really tell.
I've got Poker Tracker so any advice on how to analyse the stats from that would be great!

Thanks.