It’s now been a year and a pair of month since that rule was released (with the expansion and sectorials) . From all the games I have under my belt with the fireteam rules fighting with them or against them, my conclussion (and many veterans will agree me) is that they are completely balanced. Fireteams are powerful, but also have their drawbacks. The most important one is that the members of a fireteam must bunch together, that is stay inside a certain area/radious. This makes them very vulnerable to template weapons. Also you must keep in mind that they are powerful in an ideal setup but in a real table there are terrain scenery elements which means most of the time not all members will have the same LoS. A skilled player can take profit of this and attack from points were his/her attacker troop can only receive the ARO of one of the fireteam members. In that way you can try to eliminate thei fireteam members once at a time. Also a fireteam is dismantled/breaks as soon as it happens one of the next things: the fireteam menbers are reduced to less than 3 menbers or the fireteam leader is killed. To sum up, a fireteam has lots of advantages but also the same number of disadvantages. They can be very useful to stablish really though fire positions so that you can null parts of the battlefield to your enemy or move a bunch of minis through the table at once. They make your force to fight in a more cohesive way that’s the deal with sectorials. On the other hand with generic factions you feel more like playing Commandos because you can recruit the the right specialist for the rigth moment choosing form the wide range of units of a full faction list. To put it simply, are fireteams better or worse? answer is they are only another way to play Infinity, that is, they offer another point of view and open the way to new tactics. The best proof I have of that is that offcial tournaments are won indifferently by sectorial and generic faction lists. So to answer you question, yes you can win if you’re facing an army with fireteam and you don’t have win. You have my word of Infinity player with five years of experience in this wonderful game I can’t never get tired to play with. 😉