May Allāh's curse be upon the liar who accuse us of fabricating the virtues of Umar 
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Prophet ﷺ said
لَوْ كَانَ بَعْدِي نَبِيٌّ لَكَانَ عُمَرَ بْنَ الْخَطَّابِ
If there was to have a Prophet after me, it would have been 'Umar bin Al-Khattab.
At-Tirmidhi [Hasan] 1
This is a hasan ḥadīth according to Sheikh al-Muḥadīth Hafiz Zubair Ali Zai 
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We Love Ali (may Allāh be pleased with him)
Narrating virtue of one does not put other companions down. Our love for Ali is greater than those accursed rawāfidh. Ali has his own virtues, but here we are talking about Umar . Look at this narration by our beloved, Ibn Abbas , the cousin of our beloved (Prophet ﷺ). Read this narration, may Allāh guide you, o rafidha:
عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ إِنِّي لَوَاقِفٌ فِي قَوْمٍ، فَدَعَوُا اللَّهَ لِعُمَرَ بْنِ الْخَطَّابِ وَقَدْ وُضِعَ عَلَى سَرِيرِهِ، إِذَا رَجُلٌ مِنْ خَلْفِي قَدْ وَضَعَ مِرْفَقَهُ عَلَى مَنْكِبِي، يَقُولُ رَحِمَكَ اللَّهُ، إِنْ كُنْتُ لأَرْجُو أَنْ يَجْعَلَكَ اللَّهُ مَعَ صَاحِبَيْكَ، لأَنِّي كَثِيرًا مِمَّا كُنْتُ أَسْمَعُ رَسُولَ اللَّهِ ﷺ يَقُولُ كُنْتُ وَأَبُو بَكْرٍ وَعُمَرُ، وَفَعَلْتُ وَأَبُو بَكْرٍ وَعُمَرُ، وَانْطَلَقْتُ وَأَبُو بَكْرٍ وَعُمَرُ. فَإِنْ كُنْتُ لأَرْجُو أَنْ يَجْعَلَكَ اللَّهُ مَعَهُمَا. فَالْتَفَتُّ فَإِذَا هُوَ عَلِيُّ بْنُ أَبِي طَالِبٍ.
Narrated Ibn 'Abbas:
While I was standing amongst the people who were invoking Allāh for Umar bin Al-Khattab who was lying (dead) on his bed, a man behind me rested his elbows on my shoulder and said, "(O 'Umar!) May Allāh bestow His Mercy on you. I always hoped that Allāh will keep you with your two companions, for I often heard Allāh's Apostle saying, "I, Abu Bakr and 'Umar were (somewhere). I, Abu Bakr and 'Umar did (something). I, Abu Bakr and 'Umar set out.' So I hoped that Allāh will keep you with both of them." I turned back to see that the speaker was Ali bin Abi Talib. Sahih al-Bukhari 2
This article is not details on his virtues, as that would take longer time to research, write and publish. Rather, this is a response to an individual who lies to lead the Muslims astray. May Allāh guide him or let us witness his destruction.
For more aḥadīth, please refer to this collection 3.