Well, it is possible that this just isn't the game for you.
I don't really think it is an issue that there aren't any T1 units that can easily beat this T2 one. Depending on where in the campaign you are, a T2 unit might be a set-piece encounter that you have to spend multiple turns wearing down. Of course the map designer can do a bad job and throw too much at you, but that's the cost of having mostly community designed maps I guess.
But I also think that reducing the variance significantly would help the game severely. I fully disagree with the forum post here.
There's room for luck in strategy games. But I'm not sure if some units (see the Lancer) have a role in this game aside from forcing the player to hit the "restart from last save" button over and over. When the luck-engine is unavoidable (due to high movement), you simply can't "plan" around it. Your best plan is the restart from save button if you get unlucky.
A good game shouldn't have situations like that, where the best strategy is just hoping for the best and rolling with the luck.
I haven't encountered too many Lancers lately, although I guess it could just be a campaign design issue. I've mostly been playing the World Conquest map lately, maybe they just avoid them because of this. It is a difficult campaign -- I haven't managed to beat it yet -- but I dunno. I enjoy rogue-likes and rolling with the punches, so if a run gets impacted by RNG it doesn't really bug me too much.
I don't really think it is an issue that there aren't any T1 units that can easily beat this T2 one. Depending on where in the campaign you are, a T2 unit might be a set-piece encounter that you have to spend multiple turns wearing down. Of course the map designer can do a bad job and throw too much at you, but that's the cost of having mostly community designed maps I guess.