Here's some ultra technical ones who can play their instruments properly:

Nocturnus - check out 'Thresholds' - IMO musically the best death metal album ever created - interesting lyrics on this album sci-fi/horror

Necrophagist - great sound and solos, only thing I don't like are the stupid lyrics and song titles which kind of ruin the bands appeal for me

Cynic - excellent death metal fusion band (members joined Death on the 'Human' album)

Death - what can I say, great band (lyrics matured to the point of philosophy just before Schuldiner died (RIP)) - always superior production and guest guitarists

Carcass - check out Swansong and Heartwork, brilliant albums

That should keep your attention, especially if you like great guitar work;-)