No, not a subjective conclusion at all. You can look at the best and worst baserunners

here. Michael Bourn was the only player to be worth over 1 win in baserunning runs. Only 5 players from 2006-2009 have amassed over a win on the basepaths.

As for the value of a steal, it's relatively straightforward- just use a run expectancy chart.

Say we have a man on first base—the average run expectancy of a runner on first is 0.552. If he steals second base, the run expectancy increases to about 0.726 runs. The difference between the two, 0.174, is the run value of a stolen base. If he’s caught stealing, the difference is between having no runners on base (0.302) and having a man on second (0.726), or -0.249 runs. If we do the same thing for third base, we find that the run value of stealing third is worth 0.211 runs and a caught stealing is -0.635 runs.

If you find the average value between steals and caught stealing of second and third base, you'll find that the run value of a stolen base is about ((0.174+0.211)/2) = 0.19 runs added, and a caught stealing would be worth about ((-0.249+-0.635)/2) = -0.44 runs.

So, Jacoby Ellsbury, who stole 70 bases in 2009, added 13.3 runs via steals, but cost his team -5.3 runs by being caught stealing 12 times. So that means he added a net gain of around +8 runs added. Baseball Prospectus' EQBRR has Ellsbury adding +7 runs, but their methodology is MUCH more intricately detailed, and includes things like park effects.