RTSes are no fun for me. I'm always too busy zooming around the map trying to move guys around, and whenever there's a fight I inevitably have to keep zooming around the map, going back to my base to tell newly spawned groups to get into the fight, so I don't get to partake in my little soldier's victories or losses. At all. If they win I don't see their awesome moments, and if they lose I only notice cuz' suddenly they're gone. :\
Sowelu: Personally, I can abstract that stuff in plausibility pretty easily. A grenade-chain as they're running up, one guy in the back tosses a 'nade up to the front, calling the dude in front of him and telling him to pass it up to what's-his-face on point. Just like how the entire turn is abstracted into individual actions for your soldiers, "irl" it's all simultaneous, with the grenade coming up over the span of the turn.
...I've never really thought about it, but aren't your soldiers supposed to be like the Earth's top men? I would think they'd have gotten as good as possible on a range pre-hiring. I suppose I -would- like to see 'em slowly get better by practicing in the base, I guess, but it doesn't really bother me. I would think the "improve by firing on the field" thing accounts for being able to aim while under the stress of combat with murderous, terrifying aliens and combat experience. But still... I guess sometimes the ridiculous accuracy chances in TBS games kinda gets annoying. I remember in JA2 and Fallout Tactics, unless you were some kind of crackshot gun-wizard the chance to hit people like ten yards in front of you would be somewhere around 30%. That seems a bit low to me, but what do I know.
Overall the mechanics don't bother me, really. What always got to me was the lack of variety in weapons - for every tech type, you got a pistol, an assault rifle, and a heavy weapon. No matter what, Heavy Plasma is the way to go - your snipers in the back line up shots with a MASSIVE gun, same as your pointmen, same as your grunts. More weapon variety to outfit your soldiers would've made it much more entertaining for me - as it is the only differences between soldiers seemed to be stats to me.
Apoc fixed that, I guess, but it was just silly. I mean, your default armor is just goofy-looking. Other X-com-like games tend to do pretty well with weapon variety, though.
TBS-style games are one of my favorite genres, though, I guess.