I've changed my views on C4Ds, but I still don't like them.
People shouldn't be ashamed of using them. If someone can use a C4D correctly it can make a common signature look sickly. Some people (mostly beginners, which really aren't at fault and should really start off by using C4Ds) spam C4Ds and 1/5 times make a decent looking signature with little to no effort and then the people who literally put 1/2 hours into a signature just get overlooked because there are no fancy effects in it.
Overall though, C4Ds are good but in my opinion and its just an opinion, they are cheap.
Like I said, C4D's are like playing Pokemon Silver with 99 Master Balls. They can make a hard task easy, take the fun out of trying and you still get what you want but at the end of the day you didn't really earn your Pokemon >;o
Just an opinion though, can't stress this enough, I don't want to offend anyone.
ps I want to add that I have seen some people manipulate C4Ds in such a way, pretty nice stuff.