Most of the reviews here compare this version (inevitably) to the one starring Richard Dean Anderson. Now I've seen only a few episodes of the original and, although there are a few differences, the character itself hasn't changed much. It's like Smallville rather than Superman, a much younger version of the same character.
RDA's MacGyver was quiet and modest and mild-manner, but so is this one. He is as staunchly loyal to his friends as RDA's version. Granted, he frequently breaks the fourth wall, but that only makes the show more believable (at least, to me). Most of the actual 'macgyverings' too are almost equally surprising and awesome. This version does use more chemicals, but then there are more chemicals around us nowadays.
So, for all those comparing this version with the old, just relax and give in to the fun! This is entertainment, after all. My rating: 7 stars.