You obviously don't understand the mindset of the average FPS player.
An average conversation from a FPS match:
"Stop dying you a**holes, you're killing our score!"
"Stop TK'ing, you're killing our score!"
"Stop orbital bombarding us, you're killing our score!"
"I swear to God, I will kick your lazy a** if you don't get that objective and stop jumping around like a r****d."
It's not just about objectives, it's maybe taking the objective, killing as many of the "other guys" as possible while keeping the rest of the team alive to rack up kills and efficiency ratings. It's this little thing called the "competitive mindset".
What really ticks people like this off are the ones who "don't fight fair", by avoiding fights or using "support" methods to do all the kills. Nukes, artillery, etc. That is, if the entire opposing team does this.
Point is, orbital strikes are not really a good idea. At least, not the "let's glass the surface while they're finishing up objective B" variety. Also, if you're having them fight for you to get X resource, you really don't want to ruin all the factories and stuff. Seriously, if you're just going to nuke it anyway, why send troops in the first place?
Same thing with "suicide" kill tactics. Efficiency is something that a lot of FPS players pride themselves on. There might be objectives like this, for instance, "Cause factory X to explode", which requires a sacrifice to complete (having to stay at the terminal while a hack is taking place, for instance) that might require one soldier to die in order for the rest of the team to succeed. That's one situation which I would fully endorse.