The problem I've found is that not all battlefields have a good perch. And line of sight, even with squad sight, seems to matter. Maybe it's just me. I've got two snipers now, so I'll have one of each and see how it goes.
I didn't think of it in terms of build order, I just took the research projects as they seemed the most useful. Which I guess sort of put me in the order of capture, armor, weapons. I also started in Europe, and set up adjacent laboratories early on, so I have a lot of research bonuses.
This has been my experience too. The more you can compartmentalize a fight, the safer you'll be. In this case, flanking is a delightful bonus, not something you try to achieve for every shot.
The way I play it, ever since I got a squad of six, is to move up in covering lines. My two assaults are out front, covered by a heavy and a support. I have a sniper who's behind them and the last slot depends on what class I have in it. If it's another assault, he's up front. If it's a support or heavy, they're mid-line.
If I have to split my squad, I split into groups of three. Basically, each soldier is covered by one if not two others. In the case of say floaters doing that jetpack move where they come down behind you, he's under fire from at least two of my guys. Similarly, if we get charged by a beserker, he's under fire from most if not all of my squad no matter what angle he comes at or how close he gets.
Agreed, but it's better than nothing. Most of the time it's all you've got, especially in wilderness areas with crash/landed ufos. Most of the kills I've made were through partial cover.
Even when I was low rank I found floaters to be relatively easy to deal with. It's really only when they're in combination with other, more dangerous troops that they become a threat. Now, I did just encounter heavy floaters, and they seem much more dangerous due to their hp boost and it seems they have some kind of aoe attack now. I did manage to capture one during my first encounter, so it's not as if they're impossibly tough. They did a fair amount of damage to my squad before I got them, though.
That's an interesting idea I hadn't thought of. That being said, I often find it easier just to shoot him directly. If there's a 50+% chance of hitting an enemy that's under cover, it's worth taking the shot most of the time.
As for rapid fire, it can be finicky. I've missed both shots at ~65% and close range, but that's xcom for you. Still worth trying against close range enemies like beserkers, cryssalids, etc.