Just finished the storyline as lvl 23 Black Widow. I'd say the game is worth a download to try. It's free its not costing anything but time.
Last time I played was in beta when lvl 7 was it, which got me to lvl 26, and it was quite unfinished at the time. They really improved some of the graphics and animations. I mostly liked the assigned grouping, bosses were way easier with some extra warm bodies than it was solo. The bad part is if the randomly assigned group leader logs off, then fuck you, everyone else is booted from the group and instance, you have to do the whole thing again. Happened to me twice.
The sound is really buggy too, sometimes there's just silence. The wrong music continues to play after loading, and during loading.
Like bixxby said, the endgame doesn't seem like it will hold interest very long. I don't know if the randomly assigned grouping works on dailies, or if there just isn't enough high levels yet trying them to get assigned with a group. But from what I understand, dailies from the avengers tower = hell, x-mansion = nightmare, shield helicarrier = inferno. Allegedly the shield helicarrier dailies are for 50+. They do scale to your level though.
I had to quit in disgust in only my 2nd daily. Doc ock had heals when injured affix, and that is ridiculous bullshit. I'd do 5-10% damage then he would heal back to full. I had 2 stuns and a knockdown loaded up, they do jack shit. Ihaveknocked him down by spamming my skill but it would be sheer luck if it happened while he was healing. I even knocked him into the air with my backflip stun and he kept channeling through it. Even if I did stun him it would probably be too late. I checked out the official forums, turns out there is a heals on damage affix that is ridiculous for melee characters. So I'm less likely to get an auto-loss just from this one affix, rather than two affixes. Yay? The only solution is to wait 15 minutes, do a different dungeon to reset, and try again and hope you get randomly assigned a better boss affix. Or level up and get better gear noob. Which is what I was trying to do when I got randomly assigned an auto-loss. Apparently if the boss cons green then it should be np if you have the gear too. The dailies currently con yellow to me.