I wont start talking about the stragegic objectives of a heavy as Valve himself described them at www.teamfortress.com as well as they have been discussed to death.

Ill start with the proper Uber Heavy execution. Please feel free to add or correct.

First point to a good ubered heavy attack is proper intelligence. Ask your teammates what the status of the field is. You dont know how many times i've plowed forward with an uber only to be pinned by 3 sentrys (an uber nightmare). Ask where the sentries are and whether there is a sniper in the area. With the inteligence in place one must decide what are his strategic objectives as well as how one will go about them.

The first thing I like to evaluate is what are the immediate threats to my medic and I. Is there a sniper (is he good or bad). Can we counter snipe him before I get out there? Is there an area or doorway blanketed by stickies? Basically, is the threat an immediate kill threat or a damage threat. The damage threat allows the medic to gage when to fire, looking at the life gage of his heavy and evaluating the threat to himself. Once these questions are answered we can decide how soon to fire the uber. Remember, the later and deeper the penetration, the more effective the uber is and the longer invincibility time you will have out on the field, but dont get greedy. Go out too deep and you could get yourself or your medic killed before he can get the uber off.

I really dont like to fire off ubers right off the bat cause it gives very little effective damage time. Remember, the heavy had to move slowly into position and then spin up, leaving little actual punishment time. If I feel that there is a threat like stickies in a doorway I usually ask a soldier to spread them or now a days a pyro can send them away with his gas gun. Kamikazee scouts can also jump through right before me and this way I can move through without blowing the uber (thanks guys). Snipers always should be shot down first.

Before one does go in with an uber, alert your teammates that you are going in with uber NOW. This tells them to hang out on the fringe, or move forward if possible and take pot shots at fleeing enemy or help out with the sentries and after uber mop up. This is very important as an ubered heavy cant win alone and a coordinated push is worth 50 uncoordinated ones.

Ok, so, we have a path forward and we have decided our sentry objective and how to get there. The most important point to get in close to where the damage output is more than the repair output of the engy is to get the medic to lead. ALWAYS lead your heavy guys. It always helps the heavy to move forward while spinning. Other wise he is pinned. Cant stress this point enough.

Ok, so now you have the fog of war working on you as a heavy, the sentrys are just about to go down, you are being swarmed with enemies and you uber time is clocking down. How much awareness does the heavy have of the battlefield at this time? NONE! He's been focus firing on the sentry the whole time. Medics, what have you been doing this whole time? If your answer is surveying the field and telling your heavy exactly what threats are clear and present then you are a crack medic. Very few medics help with this. Whos the spy? These guys usually kill me as soon as it wears off cause they just stand behind me, dressed as one of mine and I never consider them a risk over the red soldier thats pushing rockets at me. How many stickies has that winbombing demoman placed below me while I make short work of his friends sentry? If you tell me I have 3 I will definitely find softer ground to stand on before it wears off. Does a sniper have his red dot firmly placed on my head awaiting the time he can make short work of it? All this information allows us to decide how to react once the strategic objective has been reached.

Finally, the mop up. You may have 2 or 3 seconds left if your lucky to take out your most important threats. This is what I focus on. Snipers if their close, demomen, spys then the rest. Or, maybe its time to sneak back around a corner and hold them back while your teammates move in and back you up. These are the situational awareness factors that make a good heavy.

But what if it fails? Maybe you need to get 2 ubers at once. As the main protagonist in the failed uber, you better than anyone else should know what failed and ask to make adjustments for the next. Too many sentries, 2 ubered demos are the solution, not enough supporting teammate, wait for them to spawn and then move forward with the whole crew. Strategize folks. Ubers are not always best spent on heavies. Heavies, recognize if your not the best strategic solution for an uber and give it up.

Thats my take on ubers anyway.