People don't think it's good, on the whole. The reason reviews on this site are skewed towards positive scores is because of "who's bothering to rate this" bias.
Realize:
- Battletoads came out before this site was founded, so people won't casually play it and drop a rating.
- Battletoads is not from a popular franchise, so people who've disliked it won't go out of their way to rate it.
- Battletoads is not terrible, so people in the mood for rating an old bad game won't immediately think of it.
So what you're left with are the people who are big fans of the old game, generally, meaning you're stuck with good reviews. The 1s and 2s that would be there for a really bad game aren't there cause it's not that bad, and the 4s, 5s, and 6s of "meh" games that it'd get if it was current aren't there because people don't generally have the urge to write a review for a 4 5 or 6 game. So you're left with the fanboys, basically, and its scores are high.
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No problem!
This is a cute and pop genocide of love!