7,62 is supposed to be a good tactics game. Also RTwP.
It has a really great engine, but I hated the pseudo RPG aspect where you had to walk around to find missions. In JA2, you spent most of the time fighting. That said, I probably gave up on 7.62 too early: I think the way it implemented RTwP was really great (with clear information on the time to perform each action), and helped with the simulation aspect.
The game would really have been awesome if it had a general structure like JA2 (ie fight 80% of the time, 10%management, 5% walking around find loot/characters of interest, and 5% cursing the sector inventory system).
When it comes to coming close to X-COM/JA2, I have a really great memory of Warhammer 40K: Chaos Gate:
There was no management/research like in XCOM, and it was linear like Silent Storm, but it featured Space Marines, and it had ironman way before it became trendy.
It also had a lot of melee and jetpacks (not hover packs like XCOM, CG jetpacks allowed you to zip through the battlefield until you ran out of fuel).
It was definitely not X-COM, but I think it is the best 40K game ever made (DoW was great, but it was a mere RTS, while Chaos Gate was trying to be Silent Storm 40K).
Vehicule implementation was poor, though, and bolters were useless (who came with this Codex Astartes where 90% of the Marines are issued pea shooters that cannot pierce the armor of a Chaos Space Marine?).