It's been fun.
Some of the missions have been very tough, which is great. I'm not a big fan of the no-effort-MMO school of thought. I'm a little disappointed by having only 3 character slots. Two are reserved for grouping with specific friends so I have only one to go out and adventure solo or in pickup groups.
My solo is a Titan Striker, currently 15. Probably higher before the weekend is over. On XBox I am 'Uncarved Block'. (I won't join for PvP stuff, not a big PvP fan. Sorry.)