Geth fleet helped Sovereign. Rannoch? The games show that they
CAN.
Nope. They make it perfectly clear that it takes hundreds, if not thousands of ships to take down a
single Reaper ground combat vessel (the smaller models), and there are as many, if not more Reaper ships than human ones. At every turn they show that the Reapers MASSIVELY outmatch the allies in conventional terms, and while it's certainly possible to take down one Reaper ship, it comes at the cost of dozens of allied ships, so while they could reduce the Reaper fleet, there aren't enough ships in the entire galaxy to actually remove them as a threat. And of course they can always repair/build more if necessary.
The one absolute fact that they drive home again and
again and
again throughout ME3 is that the Reapers are pretty much unstoppable on a ship vs. ship level, all they can
possibly do is slow them down a little bit, and maybe pick off a few stragglers. On every front they are in a gradual reteat, just trying to stall them as best they can. with ZERO hope of actually overcomming them on any front without using the Crucible.
Also you seem to think that the three options are the only
successful ones, which I do NOT believe
Well, assuming that "beating them up" is not one of those options, what options would you believe could be viable alternatives?
It was told so yes, but the actual games showed that they can be killed.
Really? Because in the game, we saw only three Reaper ground ships destroyed. One was killed by a Thresher Maw, hardly applicable to space combat. One was killed by focusing the ENTIRE might of the Quarian forces onto a single target, hitting it with three complete volleys, an act which required a unit to stay within a mile or so of it and manually target because they couldn't target it from range. They had an easier time with the Deathstar. There are thousands of those ships, perhaps even millions of them, and much larger ones too, while they have only one Quarian fleet. They could maybe pull that off once, twice, three times if the're lucky, but each time they would face the loss of dozens of their own ships, and within that handful of attempts they would be reduced bellow the level of effectiveness that the Reaper would really feel it anymore. But hey, they have six fleets, so let's be generous and say that they could take out a hundred of those ships before being completely wiped out, the Reapers still have thousands, maybe even millions of them left.
The last case was firing some massive missiles from point blank range, again not something they could replicate for each Reaper out there, because in most cases they'd be destroyed before gettting anywhere near that close.
They even specifically say that at the time you get to the crucible, they're pretty much done already, they can barely even keep up the fight, they are certainly in no place to turn that into a victory.
I do kind of hope that if they edit the ending, they will add the option to tell the Catalyst to "screw off, you're going to beat the Reapers conventionally," which immediately smash-cuts to the Citadel exploding from the "waited too long" ending, and then some shots of thousand of ships being thoroughly annihilated.