Original post by TawheedTwelver and Zaidi Shia's, this is not including subparts of alawi's (not sure their beliefs), nor Ahmadi's (simply because there are two types of ahmadi's, and i am unsure here myself) as well as sunni's affirm:
1. There is one God - not because he is one the way i am 'one' human, but he is the very embodiment of tawheed, the one, the absolute - the only.
2. He has no image, or likeness.
3. Muhammed s.a.w is the last and final messenger of Allah s.a.w
4. The Quran is the unchanged, unadulterated book. Any scholar in either madhab, the one-offs, or any hadith (proven to be weak) which says otherwise is not the Ijma or a weak narration, or one taken out of context.
5. Prophets, Ahlulbayt, wives, are creatures of God. They eat, they have bodily functions, they get sick. Muhammed s.a.w, or Ali ibn abi Talib a.s is not even dust or anything compared to Allah swt - nothing compares to him. Our love and proximity to the prophets, the family, the sahaba is only in condition of their rank and piety towards Allah swt.
6. Salah, fasting, zakah, hajj , though variances occur i.e shia's and many maliki's pray with arms by the sides, on the whole it's very similar.
7. Qiyamah, the day of judgement
I could really go on.
This is not to say, there are some fundamental differences, for example, shia's believe that God has no form, and thus can and will never be seen for instance. Sunni muslims regard companions as a whole as righteous, and refrain from questioning the actions of companions.
Shia's also respect the companions, but they do not see them as one body. They classify them into groups, those who were loyal, those generally trustworthy, those who diverted from this, those who clashed with the ahlulbayt a.s , those who did so but learned the error and so on (just rough examples). In a sense, we as shia's look at them as any other group or body of people, in the sense that, like human beings, like the companions of past prophets and like a big body and group of people, you have mixtures of varying degree's of people among them.
If we look at the top 10 hadith narrators in sunni works, among them are ibn Abbas r.a, Jabir ibn abdillah r.a, abu said al kuhdri r.a, Abdullah ibn Masud r.a, and if we go into the top 12, we begin to find Ali ibn Abi talib a.s afaik.
And these are companions generally revered and respected by shia muslims. (among many others).
But i won't sugar coat it, we do not hold some of the other names in as high regard.