Short answer: Yes
Long answer: Every scrapper combination is an adequate soloer by itself, and can be taken to the next level with IOs and incarnate abilities. They come in different flavors, both mechanically (defense vs resistance) and stylistically (willpower's ease of use vs regen's clickability). They can be AoE specialists, like electric, single target specialists like dark melee, or decent at both. Nothing in the game is as simple as a scrapper. You deal high damage, can survive most things, and don't have to worry about mezzing or other effects as much as those on the squishy side of the fence.
At high levels, certain scrapper combinations are absolute BEASTS. With incarnates, scrappers can pull off feats before withheld to only very certain combinations like Illusion/Radiation controllers. For instance, my DM/SD scrapper has soloed the ITF in under an hour with no temps or deaths, can deal over 300 dps in solo Pylon runs (higher with Lore pets), and has taken down virtually every AV and GM in the game available at level 50. I'm currently practicing to run a solo-STF. These are the kinds of things that a scrapper can do with the right combination/build/incarnate and most importantly, the right player.
TW/Elec Optimization
Also for any wanting to make a new scrapper, I honestly would suggest waiting till i21. I know I am waiting for Street Justice, but others may not want to do that.
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