If the game made artillery realistic 'Mechs would take a secondary role to artillery duels. In campaign play I've seen 'Mech companies slaughtered by air strikes, which made Aero the most effective weapon in the campaign.
It all depends on the points. If the points don't reflect the capabilities of the aircraft then the points are wrong.
Personally I've never liked how they diverged Aerotech into what is basically its own separate system. Why try to bridge the RPG to Battletech but keep Aerotech different. And I mean in terms of weapon ranges primarily.
Battlemechs are more resilient to damage however. I've seen heavy aerofighters lose their entire compliment of weapons in a single round or so and aerofighters missing their piloting roll and crashing into the ground in what is close to a mint aircraft. Mind you our group uses house rules that enable aircraft to be on the main map instead of needing some separate aero map, not sure how much the regular rules differ in terms of piloting rolls and so forth.
Same should be with artillery. If artillery is too effective, then raise the points or lower the effectiveness or add things like requiring a spotter, etcetera. I think my biggest issue with artillery is the fact it does such high damage (20 pts homing) out of sequence. Other games like Babylon 5 Wars had missiles for example hit before other weapons, and in small portions it wasn't bad but when they started to introduce massed amounts of missiles (like a missile heavy race) it became problematic. Battletech is a game that's built around simultaneous combat, is not IgoUgo so, to have a situation where your units can not retaliate is a bit problematic. And having artillery do huge single point hits rather than spreading the damage about will increase the chances of a unit getting killed or knocked out.
Remember that the universe says that combined arms formations like RCTs are effective. So there should be an in-game reason for using those sorts of formations.
I'm not a huge fan of lrm-deployed minefields either. Never understood why lrms could do more damage as a minefield than as direct-fire missiles. They are I believe another weapon which when used in large quantities can become problematic.