I thought this show was awesome from the moment I first saw it, back when it first came out in VHS tapes long ago. To this day it remains in my Top 5 favorite anime of all time, but to most people this show is all but unknown.
Being made in 1994, this show is pretty old now, so don't expect something visually on par with the best anime of today. Yet, when I compare it to other well-known anime of its time, such as Neon Genesis Evangelion made in 1995, this show is actually ahead of them in terms of how well it was made and the quality of the drawings. As others have said previously, the story sounds a bit corny, but the show isn't what it seems to be about at first glance. It's more a show about a girl who is seriously training hard to be a real fighter, rather than being a show about fake wrestling.
The show is just well-made from an objective standpoint, despite a storyline that some might consider impossible to pull off. I think that's why some of the previous reviewers found themselves enjoying this show in the end, despite low expectations.
Directing: 5 out of 5 stars. One of Akiyuki Shinbo's oldest works. He is now a famous anime director who has done many of Japan's most popular recent top anime, including Moonphase and Negima?! (the better remade version).
Story: 5 out of 5 stars. However, this is just my take on it. I like the idea of a story about a girl seriously training to be a real fighter. Some others might find that idea ridiculous or stupid, and I can totally understand.
Drawing style: 5 out of 5 stars. The character designer for Metal Fighter Miku was Takeshi Honda, who was also the lead keyframe animator for the entire Neon Genesis Evangelion series, a very little-known fact. The drawing style for this show is thus very similar to Evangelion and other Yoshiyuki Sadamoto works, something most people fail to notice, but the resemblance is obvious to me.
Drawing quality: 3 out of 5 stars. Normally pretty good quality, however episodes 3 and 8 have ultra degenerated, terrible drawings, where they indeed look like goonies just as a previous reviewer said!
Animation quality: 3 out of 5 stars. Nothing special either, but not overly cheap with the frame-saving. Considering how old this show is, it's easily up to standard.
Music: 5 out of 5 stars. BGM composed by well-known Japanese composer Kenji Kawai, who has composed music for countless anime series. The intro and ending songs, composed by someone else as is usually the case for anime, are amazing as well (it's rare for anime to have both good BGM and good OP/ED songs).
Unfortunately, I do have some complaints regarding the quality of the DVD authoring. The opening and ending sequences weren't done correctly and play at half-resolution (weird interlacing). The Japanese track of the show is low-quality mono of the typical 90's Japanese broadcast standard. The English track is in stereo but the DVD authoring is messed up and the sound often clips when characters speak, which can really mess up your ears and speakers (don't play the audio too loud if you listen to the English track).
Although this DVD set was released many years ago it's still not that hard to find for some reason. Metal Fighter Miku was a great buy 6 years ago. Nowdays though a lot of good anime come out as cheap boxsets...so I wouldn't pay $40 for this if I'd never seen the show before. But I think it's not hard to find this DVD set for $25 to $30 because it was over-printed....so if you can find it at that price and believe in my review and don't mind "old anime from the 90's" I strongly recommend this show.