In old CoH Scrappers were my favorite. They were the ultimate solo toon. The tankers low damage output made playing a Tanker too sloooow unless you were playing with a group. Brutes and Stalkers didn't exist yet, and then for a long time after they did exist, they were purely on the villain side. Now Brutes and Stalkers can be on either side and we even have Sentinels... Brutes seem to have better damage output then Scrappers once their fury gets going, and their resistance caps are higher... Stalkers have the same resistance caps, and seem to be able to crit more reliably... plus they have stealth and better AOE defense than Scrappers. Sentinels have essentially the same defensive capabilities as the Scrapper, but can do their damage at range... Hard to see where the scrapper fits in.