I understant that Thanos is really powerfull but you can not expect him to deal at the same time with the three most powerfull heroines of dc universe
(so team win)
No amount of top tiers can defeat Thanos of Titan! He can create a hundred forceblocks every second and forceblocks are auto-hits that can't be broken ever!
Serious answer: I'd say with PIS/CIS on a single top tier could take him down and PIS/CIS off it depends on the top tiers in question but I'd say three to five.
__________________
“Where the longleaf pines are whispering
to him who loved them so.
Where the faint murmurs now dwindling
echo o’er tide and shore."
-A Grave Epitaph in Santa Rosa County, Florida; I wish I could remember the man's name.
Any specific examples you're thinking of? And I agree it's a longshot, but it's their best bet for even 1 win against him. Does Thanos typically have his shields up through out the entire match?
The lasso also had Ares at its mercy. It doesn't help Genocide is a flawed genetic copy of Diana to begin with not to mention the lasso's powers weren't activated at the time. As I said, it's a not sure thing, but it is their best option.
It's been a while but if memory serves correctly, the Marvels were shown to resist the lasso's power during the All-Star Squadron and Crisis on the Infinite Earths arcs. There was also the War of the Gods story line when getting the lasso around Billy caused so much of a disturbance Diana could not hold on. Of course it's been a while, but I'm pretty sure that's what happened. There have been other instances. I know that, but I can't remember any off the top of my head, because frankly, I never actually cared about Diana too much. The only reasons the Marvel instances came to mind is because of the recent New Men portrayals in "Justice League: A Crisis on Two Earth's" movie where they had an interesting take on the Marvel's.