I know everyone bashes on wikipedia, and my own college claims that using wikipedia as a source in your works will count off, regardless of the class.
But when it comes to linguistics, I have a hard time finding anything as detailed as wikipedia. Besides, the individual articles on the ipa symbols seem reliable to me (though some, such as the article for click consonants, leaves much to be desired). And looking through the article for the German language, I don't really notice any glaring errors (I'm an intermediate in German that once listened to German music pretty much exclusively, I actually quit studying because I found that I knew and understood German words that I didn't know the English translation to).
As of late, I keep going to the article on the Korean language, because sources are so few, and also highly contradictory. No one seems to agree on what the tense consonants are. People claim its everything from fortis to simple allophony involving aspirated, voiceless, and voiced consonants, and even phonemic tone. No one knows how to pronounce those damned consonants, and I really can't force myself to move on until I can. Then again, I mostly just want to study the language for 1. to get a deeper understanding of an agglutinating language, and 2. I spend hours a day watching k-pop, so I figured it would give me some encouragement and also let me turn my obvious addiction into something actually productive.
The younger people apparently don't bother to distincguish aspirated, tense, and tenuis consonants reliably (often they just pronounce whichever at random). Koreans are apparently learning to differentiate their secondary articulations more by the tone it gives the syllable. And of course phonemic tone isn't obvious in song anyway, so I guess its kinda moot for me.
But the question still stands, how reliable is wikipedia? Besides the tense consonants of Korean, I've also noticed some disagreement over the vowels. For instance, different sources say that ㅡ is either a ɨ or ɯ sound. Also there's inconsistency of whether ㅓis a ə, ʌ, or ɔ. Though I think the latter may be a set of allophones. Personally, this vowel typically sounds rounded to me. Though ㅗ also often sounds like its between o and u to me. Korean vowels are so weird...