The issue of tanking.

So lately ive been noticing how many of my games are lost due to the impact of the tanks in our and/or their team.
In fact Id say that almost 50% of my losses are due to our tank either not being sturdy enough (this could obviously be because of the rest of the team not killin/disabling enough of the enemies) or coming into fights completely wrong.
The obvious way to combat this would of course be to play tanks myself and try to salvage the situation myself. The problem is that I have a hard time paying attention to all the things that a decent tank should pay attention to. Maybe im wrong, but it seems that playing casters/carries are more about quick reactions and finding openings where as a tank needs to keep track of the map (map awareness is imo even more important for tanks and initiators) the opponents used skills, their hp, our hp, our used skills and so on. This is in addition to the normal required skills just to make the most of your own abilities (as in soaking damage, disabling other team members and protecting the squishies). Somehow the learning curve is just a little too steep for me and if Im forced into playing tank several games in a row it takes the fun away for me.