So as has been covered, the recon camera is good for planes to spot and fly overhead.
It is also good to let you shoot and still spot, without giving the 'spotter made an attack' penalty. This, of course, is only useful on units out of hiding that want to make attacks. So in the example of recon camera + medium laser, if the recon camera is successful you get to shoot the medium laser. If not, you have to decide if you still want to spot or shoot, due to the penalties of both. On a unit with more then a single medium laser, the recon camera becomes more useful. I do this with my tag units a lot--there is a DI multipurpose with a light PPC and tag, and I use it to spot for LRM carriers. If the tag hits, then I get to shoot the PPC. If not, then the LPPC doesnt shoot and I just spot. No guided munitions in that force, so a recon camera and TAG function identically and its a piece of gear I use every turn cause I have that turret LPPC.
Hidden units requires a scenario special rule, and of course make fantastic spotters. You dont need recon cameras on hidden units.
If you are using the optional LOS maximums in tac ops, the normal limit for LOS with no overriding conditions is 60 hexes. The description of a recon camera is, what, 5 KM visual range instead of 1800 meters for 60 hexes? So if you have very far away spotters, or even snipers if you use LOS tac ops ranges, then the recon camera is supposed to see farther then units without a recon camera. And a medium laser does have a LOS range, so if you play with lots of Tac ops rules you can snipe from really far with recon cameras plus medium lasers. I have no idea what a game using ALL the tac ops rules would look like, but you'd need a LOT of maps to represent more then 60 hexes per normal limited LOS.