Champions Online has similar problems in that the free power sets aren't viable for soloing (except Guns), but the DLC powers are and making a custom power character is game breakingly good.DC's not bad, but the character creation will sort of shove the DLC/xpacs in your face with how much cooler the non-free powersets are (Lantern Ring, Red Rage Ring, etc). It's still fun, though, just wasn't what I'm looking for in an MMO I guess.
I've actually gone through all of DC Online with free characters... I rather enjoyed my One-handed/Fire mummy character and my Beam/Gadgets villain, but the game is SO short. If you aren't up for raiding the same dungeons all the time, it's not worth playing.
I've heard a lot of good things about Star Trek Online, which has a similar character creator (you can make your own alien races!) and tons of content. It's also getting an expansion to cover the Delta Quadrant, even getting back the actors for Neelix, The Doctor, Tuvak, and Harry Kim. All are going to be doing voice parts for them.