You can definately go it alone if you like, even if it is billed as an 'MMO'.
I started again a few weeks ago, and got to say that after the turgid crap ( can I say crap?) that was WoW, this is a breath of fresh air !
You can play this as you like ... hunting 'Rats' in Hi-security space if your a carebear, making your fortune blasting hapless bits of rock to smitherines via mining, sat on your arse playing the stock market or upsetting someone where, somewhere by blowing them up for no apparent reason !
The really nice thing is, that unlike conventional MMO's where you pick skills , insta-learn them then get a new skill next time you level up ... your toon learns it's skills in Real time. even when you are not playing your toon is actively progressing. The flip side is that getting very good is going to take quite awhile.
Anyways .. lovely graphics and a game you do not have to devote time to.