How accurate (OCD) is most draw pattern security features on smart phones?

I'm contemplating about turning my "draw pattern" password as presently I don't lock my cell phone (out of laziness). If I turned on the feature, how accurate do I have to be in order to replicate the pattern I use in order to unlock it each and every time I use my phone?

Do you use this security feature on your smart phone? Do you have any problems with this touch screen feature? Do you even have a password or lock your phone so others' can't access your phone and data?

I could go with the pin number I guess though I can imagine that's easy to circumnavigate if one is serious enough to break into someone else's phone.

I have a very basic smart (a mere 100 IQ) phone: an LG Optimus Slider in case your curious.