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im not talking only about wikipedia but wikis in general.
do they provide any real value.
can you use them for tier 1
?

Wikis can be good for your linking, but don't make the assumption that just becouse it's a wiki it's good, I treat wiki's just like I treat any other link posibility regarding the metrics I'm looking for.
Also I do hope you are not considering only creating links from wiki's but instead throwing them in a natural apearing backlink profile, otherwise they will have little to no seo value and you might as well call big G and tell them your trying to game their algo

thanks spot on

You can use it, but just as divctaion for your baclinks profiles

I used wikpdia btw