Check out virtually any lawyer listserve and do a search on web marketing companies and you'll probably come across a bunch of mostly negative things about the company.
"They make you sign three year contracts"
"They compete against you in your own market by trying to get leads and selling them to you"
I paid them a bunch of money and when I tried to get out of the contract they took all 'my' content away"
Here's a cool site I found where you can see 'inside' some of these companies.
Sure, its mostly grumbling. It's a site for employees to "rate" their employers.
Check it out. Some of the comments allegedly show how they cheat lawyers
Check out GlassDoor.com