Dps scales very slightly with new gear, it's mostly about your builds, and only getting a dps meter and then spending time trial and erroring at the combat dummies will get you good. Or just copy someone elses build.
Once you get to ql10, dps only increases about 100-200 as you go through the decimals. So at ql10 I was doing about 1500dps, ql10.1 I was doing about 1650 / 1700 ish. Last time I played I was around 10.3 on average and I was getting close to 2000 dps. Although it changes drastically based on your group. If you play with a bunch of former WoW fucktards (you can tell them a mile off because they are dumb fucks and have no personality), they have builds that only serve their own dps because they are too selfish and stupid to think about the group. So you'll find everyone does pretty mediocre dps. If you group with good people (rare), they will have passives that boost everyone in the group, and if you have a bunch of people in the group all doing this, I ended up with about 2600dps at one point. In other words, I got almost 1000 extra dps just purely based on who I was grouped with.
Tbh though, the grouping in the game is one of the weakest things. Getting in a bad group is fucking painful, because you are locked in. Once you have killed the first boss, (in NM mode) the instance is locked for the next 15 hours. So if you get in a shitty group full of idiots and you kill the first boss but barely, then you can end up failing 10 times on the second boss, then 10 times on the third boss, and then 2 hours later the group falls apart because people start rage quitting before you get the 4th boss down. It's horrible. You could just bail, but then you spent all that time and got very little out of it, and you are locked from that instance. And yet a good group is fantastic. I once did Polaris NM in about 14 minutes with a group that not only were great players, but fun to be with. But a group like that is one in a million unless you get in a really good guild or something.
p.s. At this point I still think people should just play different games for different things, because there are no games that are good at everything nowadays. If you want to solo, play some TSW. The missions are a lot of fun, exploring is great, and so is tinkering with your build. But if you want to group, log out and play Vanguard or Everquest instead. And for raiding, play SoD or whatever.