When I was testing
Memnarch in my monoblue I used a lot of blue infinite mana combos such as with
Palinchron. Most of them are quite complicated and consist of 3 separate cards.
Even when game ended up in a manner when I collected every permanent in the game i never was "that guy". The reasons why:
a) Memnarch
* "Its an artifact creature. Anything you can imagine can kill him."
* "Mycosynth lattice is an useless card. It does nothing. Playing it in a 2 card combo does not fix that"
b) Infinite mana combos I had at that time
* "Its very low probability that you collect 3 cards for a combo
Honestly, there was but one game when opponent had complaints on Memnarch. When I included Top/Future sight/Sculptor combo for the first time nobody ever considered it to be broken. Again the reason like "you require too many cards".
Now I mostly play with one playgroup. Combos are OK, and everybody knows what is going to happen when some cards hit the table. Previous playgroups were not fans of combos, and barely were able to understand why are some cards good even if the CMC was 4+.