front line tele entrances.

Anyone ever try building an exit leading to your teams resupply with a tele entrance around the general area your team is fighting so if there are not enough medics and there aren't any real health pick ups around like in badwater or gravel? Could it be worth it on any server with less than 24-32 players? Of course this is only a suggestion for when there is already an engineer with a tele entrance at team spawn.

Not worth it.

Even back before the (recent) Engineer upgrade, spending time taking dodgy teleporters back to spawn was a horrible waste of time.  If you're that low on health, you're better off dealing damage, dieing, and respawning than taking a tele back to spawn, refilling, and then waiting for the other tele to finish recharging. 

With the update, a level 3 dispenser will more than take care of your needs, and teleporting back to spawn is a useless waste of time.

Yes, teleporting back to spawn is a waste of time. I have put one outside the secondary spawn on 2fort leading to the main, to circumvent snipers, but only rarely. Best to put a teleport directly to your SG and Disp so you can get back asap if needed.

How about an entrance at your sentry leading to an exit at a decent ninja sentry location for when an ubered demo comes in and wrecks your sentry? I hear it can work in pubs sometimes.

Your teleporter is much better used for your team.

Using teleporters tactically in your gameplay really only works in arena, where your team doesnt beneift from teleporters to get to the action.

Yes, I have done that too. I have also used it to get back in forth by the main spawn because it usually blocks my path (with the right placement) I can jump off the exit onto the dispenser to get to the courtyard, then tele back to hay room. I only do this when I have to play turtle engie.

I did something similar to this.

Once.

Out of 200+ hours as engineer.

It's a nice idea on paper, but in practice you've just deprived your team of a downstream teleport, which is much more important, especially with the abundance of healing and ammo at the front lines.

Ah, as I said, I only do it when forced to turtle up. I dont like it, but it happens. The frequency of which it happens depends on my teammates' skill as well as oponnents. I prefer to use the tele to get guys to the front asap. All n all, yes, getting your guys to the front is best, keeps the enemy on defensive. But lets not rule out the other uses, they all have their place and time in the right hands. Getting one teammate to a non-existant front line (because the front line is in your base) does not take precedence over defending your intel. A good engie can stall the rush long enough for your teammates to get rid of them.

This may come from me playing all classes. You have to know when to run defense and when to go on the offensive. Versatility is important here!

If you need a tele back to the spawn, then the medic and I are not doing our jobs correctly.  My tele is for moving people forward to create an essentially new spawn point closer to the action.

PS.  I love the new tele upgrade. It's about time.