I like them fine. The trend in RS though is now toward lighter more narrow rails where you just add sections of rail where you need it. Hopefully we'll start seeing that show-up more in airsoft. I know Madbull has the Troy TRX line, but I think we'll see more of those types of light rails in the future.
All those rail covers just add weight, but there is the need to protect the rail edges from damage. I favor rail ladders myself. Low profile, low weight.