It really does emphasise how important the beat is to music doesn't it. Although there are quite a few similarities between grime and hip-hop, grime is a development from UK garage so at its core there's something different. Therefore, just because there's someone MC'ing doesn't mean that a hip-hop fan would like it, any more than a fan of hardcore punk would necessarily also like thrash metal.
I should mention though, with regard to those links 'I Luv U' is probably the only one I'd normally use as an introduction to the genre. Khar just mentioned he'd be looking stuff up on youtube so I picked out a few things I like that I could find on there, but since grime's still a very underground genre (there's been a load of mixtapes, singles and eps released but very few full albums) there's not that much on youtube, and less with half decent sound quality. So maybe if I'd been able to find JME's 'Poomplex', Roll Deep's 'Flame Grilled Whopper' or Lady Sovereign's 'Cha Ching' (yes, Lady Sovereign used to make grime, no, it doesn't sound much like what she does now) you'd have been leaping around pointing your fingers at the ceiling yelling brap.