I just finished watching it. This is one of those rare moments where the anime is better than the actual manga. '
There were only two things I didn't like:
1) Bardock didn't die
2) Bardock turned Super Saiyan
Yeah it sounds ridiculous especially since this is essentially what the OVA is about but there's been a trend lately where they've given characters Super Saiyan transformations. Vegeta, Trunks, and Broly all were given Super Saiyan 3 transformations in Raging Blast which is absolutely ridiculously non-canon.
Also Dragon Ball Z characters have the habit of not dying, and I feel the impact of a character's death is lessened if he/she brought back to life repeatedly.
However, the manga series and OVA handled this fairly well. While I didn't like the idea at first, I'm kinda glad we finally put the Super Saiyan legend to rest. Glad it just wasn't Broly. Oh and it's great to see that Bardock has some kindness in him despite being Saiyan. You can kinda see where Goku got it from, but then again...Goku suffered a severe blow to the head XD