Since everybody seems to have a take on this, here's mine.
Any text book or Web site that uses sounds from one language to approximate the sounds in another (whether it's Japanese or French or whatever), is doing two things:
1. Leading you to reason language which, if you don't plan on doing any translation, you don't have to do and in fact should not do. (That's one of the reasons why kids are so good at learning other languages, because they just accept what is without trying to reason out the rules behind it.)
2. Screwing up your pronouciation. The Japanese "i" does NOT sound like the English "e". The English "e" is too long. The Japanese "i" is very short, like the "y" sound in "puppy" or "happy". Same thing for the Japanese "u" sound. It absolutely, positively never sounds like the English "oo". (oo is too long, comes from the throat, whereas u is short and comes from the mouth) I can't think of any sound that approximates the Japanese "u" sound in English. The "r" and "l" thing is really tough. it's as tough as it is for English speakers to pronounce the French "r" sound correctly.
If at all possible, what I'd do is find a Japanese national, get him/her to tape you the pronouciation of all 46 sounds and associated derived sounds (ju, juu, etc.) possible in Japanese, and you should try to emulate these sounds instead or trying to reason and approximate them.
Of course, if you're only aiming at being able to speak and don't care overmuch about pronouciation, then what mdchachi said is true, "the other stuff sounds fine". At least, that's my take on it.