if youre writing a review you might want to include why its going to be good. just saying its going to be good doesnt really help much. also important to keep in mind that everyone has opinions and most of the time yours is wrong :P
for real though, say why its good without spoilers. if its being picked up from some other tl'er and its lacking in chapters leaving you not much to go on say why you think it will be good based on whats there so far. alternatively if you can read the raws you might want to mention that just to avoid an instance where ppl think youre entire review is based on 20 tl'd chapters.