No. The smith rack is actually significantly worse than a bare bench for safe benching without a spotter, because you can't escape if you fail.
Obviously the ideal option is to go to a gym with a good power rack you can bench in (or even the special bench press half-rack things I've seen) so you set the safety pins just below the level of your arched chest. Drop the weight, flatten your back and it's on the pins (so you can't really use this method if you have to do flat back benches). The beauty is that if your gym is so empty you can't get a spotter, a power rack's probably gonna be open.
But if your gym doesn't have these, there are other escape options.
I don't like the roll of shame. I feel like if I tried to do this with any bench press I'd be likely to drop, it would literally kill me.
Here's how you correctly escape a failed bench:
You leave the clips off the bar, and roll TO THE SIDE.
The plates fall off, and the weight on the opposite side will flip the bar right up off you. Really noisy and such, but if the option is damaging yourself, literally risking your life, it's what you should do.
Here's the first video I found on youtube about it:
https://youtu.be/XGkRDcMeSTY?t=162 
