Thing I really don't like about RWI (and JP) is how they have a picture, rhyme and action for each sound (eg ay - may I play, ea - cup of tea)
This sounds like it helps but is actually Information overload for a child who struggles.
Ie when they see 'team' you want them to think or say 't' ''ee' 'm' - teem. Not t - tiger, ea - cup of tea, m - mountain. So it's actually worse than letter names or putting 'uh' on the end of every sound.
Combine that with actions and they aren't thinking about how to read a word at all.
Plus the huge emphasis on stand alone sounds. 'ea' has no meaning outside of a word. It could be 'ee' or 'ae' depending on the word it's in! (team or great)