NARCs, TAGs, C3, LT, Long Range missiles (Arrow).
Yeah, none of those things are in MWO. Accept NARCs and TAG, but not in any way that you would recognise.
MWLL and MWO both have their similarities and differences, their pros and cons. But at the moment MWLL is much more fleshed out, slightly more rough and ready, but is definitely more feature rich. MWO on the other hand is incomplete, but has the benefit of a company behind them and the resources that come with it. I prefer MWLL, but MWO is definitely worth the free download.
"If you truly loved MWLL, you will hate MWO with your guts."
That's a little strong. MWLL is probably my favourite game of all time, and I don't wish any ill will on MWO or it's team, on the contrary, I want them to pull their finger out their ass and make a decent game. I am upset about some of choices they have made, and resent the model they have adopted, but overall want the franchise to succeed.
"If you are fanatic about anything, you will hate anything that is different"
However I can see how some people could still resent PGI for their obvious involvement in the discontinuation of MWLL development. But c'est la vie