Absolutely loved this game. Its maps and soundtrack captured the sombre gloom of an Earth ravaged by Tiberium poisoning so brilliantly, including the appearance of hostile Tiberium based life forms: visceroids (semi-sentient mobile blobs that swallowed any living thing they came across), Tiberium Fiends (hyenas that shot out Tiberium spikes) and veins that slowly shredded any vehicle heavier than a Wolverine walker or Nod Buggy. The song 'Valves' provided an oppressive backdrop to the start of the campaign missions.
And the GDI walkers were a treat to play with because they reminded me of Exosquad e-frames even if they couldn't fly.