MP10. You know how much time it took to get the keys? Now think about doing ubers on MP5 and getting no organs. Think about starting ubers on MP8, and you get an organ on the first fight, but no drop on the second, and for the third you realize you can't beat them (the machine would be lost).
That's why you need a group of whom you know it's capable of beating MP10. Lower MPs are just a waste of infernal machines, but MP10 uber is still something that some people struggle. Get a group of players (or one well-geared player) who can kill ubers on MP10. That's the ONLY thing you should do. Don't solo them, and don't waste your machines on lower MPs.
I haven't played in ~2 weeks because of vacation, but I can check if my friends want to do ubers this week. But not sure about that, if you find someone else to carry you, go ahead, we might not play this week at all. In case we do ubers, I'll add you in-game. In the meantime, you could use the LFG forum to look for people.
Edit: with regard to the post above me, keep in mind that you can't change MP once you started. If you find out that your MP level was too low, the machine is wasted (easy kill, no organ, bad luck). If you find out that you MP level too high, the machine is wasted (can't kill, no organ, bad luck). That's why just attempting ubers solo makes zero sense, because you'll waste some machines to "find" your MP level and then end up not getting organs because even on MP9 (which is already insanely hard for all non-high-end players) there's a chance of getting no keys. Also, the perceived difficulty depends very much on build and group composition.
Thx to Rhye for pulling me through Uber runs yesterday !
Usually i play MP 4-6, so MP10 came as a culture shock to me.
I switched my 30-tick DW-WW to a 1h-HOTA build.
Since i had zero practise with HOTA, my gameplay (follow RHYE
storming cross the screen) sucked big time, but finally i managed
to handle mobs rushing and surrounding me (mostly )
The result was quite a nice Vit-HF ring for leveling toon 7-10 to level 60 (achievements).