isn't granary's last impossible to defend in 6s? sure some might like it but to me it has always been a "bend over and take it in the ass" kind of point
Its certainly difficult, but far from impossible. If you lose mid, your med dies and theres stays up, then yes, defending last is going to be extremely hard. However, they have to uber out of the doors most of the time, and then the uber has to last long enough for them to push from those doors to the point itself. If you can juggle them enough, or have your scouts focus secondary targets so the med has to flash, then the uber isn't going to last very long and you can just hold long enough, on the pipe and such and push them back.
The other thing to consider, is that as far as comp is concerned, if a last point is easy to defend, chances are the map is incredibly problematic. cp_snakewater, cp_gullywash, and cp_warmfront/coldfront are all examples of maps where players complain incessantly about the last points being difficult to push and attack. If you can defend the last point easily, then that usually means its easier to defend last than to push the second point, which means you are incentivised to stay on last, turtling up like crazy and dragging the game out forever. Go engie, heavy, pyro, sniper, pick anyone coming in, soak up their uber like crazy, and do it all without ever putting your med in danger.
If the last is hard to defend, then when you sucessfully defend it theres a bit of an adrenaline rush, an assurance of your teamwork and coordination, and the wipe gives you a ton of momementum to push the enemy team all the way back to their second point. It feels so much better to be able to push back from a difficult last, but because the general power is in the hands of the attacking players, you'll more often see a game come to completion, rather than seeing it stale mate out for 60 minutes as each team tries again and again to push last point.
I think the best parts about granary last are:
1) Has some interesting height located centrally to the point, but not directly on it, so you don't just get an advantage by sitting on the point. The pipe is great, but you can't just sit up there and spam all day. If someone jumps you, your almsot always going to fall back which leads to some dynamic exchanges between being on pipe and not being on it.
2) Variety of options for pushing, many of which are disconnected from each other (sightline wise) so you have to cover multiple angles in order to defend effectively. They can sticky off one of the garage doors, but the other has to be defended by someone else. Likewise, they can just push uber out of the pipe door and jump the demoman. ETC.
3) Has some roles and locations for offclasses, without making them too powerful. Heavy on the pipe can be spammed by demoman easily. Sniper can peak the point from the window, but can easily be spammed out or dodged. Engie can set up behind the fence or to the left of the point behind the pipe, but either position can be spammed by demoman with very minimal effort. Spies decloak in rocket room. ETC ETC.
4) The overall displacement ground slopes gradually and is generally free of clutter. Combat revolves around either a few distinct props (concrete blocks, crates, fence or pipes) or it takes place on a reasonably flat surface, so combat is fairly balanced. It might seem boring or lackluster from a payload or a/d perspective to have such a flat area for a culmination, but as far as 6v6 is concerned it leads to clear and concise combat.
5) General purity. Instead of going for a bunch of gimmicky nonsense or overly complicated geometry, Granary (both at last and in general) is an incredibly precise and simple map from start to finish. This means the focus is on the players and their class roles, and less on the actual map itself.
If someone was going to be critiquing a last point on a 5cp map, I don't think granary is the place to start. Both badlands and granary are held up as pefect maps by the majority of 6v6 players, and barring some extreme change in how comp TF2 is played (har har, good luck with that), its incredibly unlikely they'll be dethroned anytime soon.