I don't see the comparison with Meshuggah. Very different bands and styles to my ears. I can very happily listen to Periphery, though it's a bit on the light side, and they don't seem to play that hard. I love listening to Meshuggah, and Gojira for that matter. Great local band in Oxford that's somewhere around the periphery mark is Taste My Eyes - brilliant live and they really need to update their myspace profile with some proper recordings!
Part of the success of Periphery (aside from their undeniable musical talent, whether you like the style or not), is the work they've put in marketting themselves. They've been very savvy about putting info/music/updates all over the interweb, which has really paid off for them, it would seem!