Very true. Although to be fair, it has been a while since a Marvel writer, in all seriousness, has dusted off a crusty C-Lister, devoted the talent and time, and gotten that character to move up a rank into B-Lister. They're giving Moon Knight a good try, although decompression is going to make that process slower than it could be. The last one I can think of is Purple Man and Jessica Drew (Spider-Woman I), and both of those were due to Bendis. Hate on him all you want, when he wants to amp someone, he can do a serviceable job.
Oh, and of course, all of the Thunderbolts. But they don't count, because they're not villians anymore. That remains my one quibble about the franchise; good villians are hard to come by, and non-arch villians who either want to take over the world or are overexposed are a dime a dozen. The more faces that show up in Thunderbolts, the fewer villians there are. Sure, there are more, but frankly the fans can be a bit too harsh to accept too many new villians or to accept a name they haven't heard of in 30 years. I mean, believe it or not, I had a great idea for a Matador II who could be very vicious (basically imagine Vega from SF2; bull fighter by day, vicious killer by night). Matador is a Z-List DD jobber. But if someone tried that to sell a cover, would it be well acceptted? No. Marvel has been #1 for years, so expectations are set very high, higher than DC, frankly (who has generations of crap to live down). Not too many of their creative/editorial team can manage that. The rest are too busy being clever to actually try giving the fans what they want, without B.S., and seeing what happens.
Still, something needs to be done about the villians. Marvel's too stuck on "realism" to have their villians do something "simple" like gather en mass and attack a city, but something should be done. A reorganization or something.