I am currently re- watching season 3 of the show, which contains the excellent Xindi arc. I really like the hard edge to Archer, which is nicely balanced by the more genial Trip. The relationship between Trip and T'Pol looks promising, but I think wasted a bit as the show develops toward the finale of season 4. The season itself has a good variety of interesting shows, and works really well. The conclusion of the serise does leave a little to be desired, and must say I have mentally struck a couple of bits out of my own personal cannon. I wont say more so not to spoilerize the ending- you will have to watch! Highly recommended!