Mehmed Ali Pasha (not the one in Egypt) was German - he converted to Islam and entered the military.
There were three very good generals in the war: Mehmed Ali, Osman Pasha, and Ahmed Muhtar Pasha (in the East) - they all did very well, but the strategic situation was relatively hopeless after the inaction of the first months, and Suleyman Pasha's waste of his army making frontal assaults in the Shipka Pass.
Even at this stage, a central leader could have saved the day by relieving Suleyman and placing his troops under the C-in-C in Bulgaria. The Russians were spread rather thin, and Mehmed Ali's offensive to relieve Plevna did surprisingly well before losing steam due to lack of numbers. Suleyman's army was around 40,000 men - these added to Mehmed Ali's could have driven the Russians back over the Danube.
The Ottomans were keen to have the Russians attack first and didn't want to invade enemy territory due to the impact this would have on opinion in the West, although they did land in Abkhazia in a fairly skillful amphibious attack - although this wouldn't have been possible in a more heavily defended area.
I think what the Ottomans should have done is placed an army in the Dobruja, and then occupied Galatz - this would have severed the only rail line leading south and would have threatened the communications of the entire Russian army. The Russians would either have had to take the city, which would have been nearly impossible, or leave enough troops to mask it - either way, their logistics would have been a nightmare. Dragging heavy artillery south would have been very difficult, provisioning the army very difficult, and it probably would have been necessary to build another rail line further West.
If they could prevent the Russians from crossing until they could get the whole army in better positions, the Russians would have been unable to succeed.
The main opportunity the Ottomans had, besides superior troops and armaments, was that the Russians had seriously underestimated them and not mobilized enough troops to win. They ended up having to mobilize double their initial force size, and it was still close.
Ah...so the disaster can all be blamed on Suleyman Pasha?
But I thought Shipka Pass is important to reach northern Bulgaria? Or do you suggest that Suleyman Pasah should have use other pass?
Suppose he did use another pass (as the RUssians did) then what army is between Shipka Pass & Adrianople?
I think in the aftermath, supposing the Ottomans are victorius, should be the cancellation of Russian trading privileges in the empire. Russia & her allies: Romania, Serbia, Greece. Probably even confiscation of properties? Say, this can be considered indemnity.
What do you mean taking Galatz would be nearly impossible for the Russians?