I think I would have enjoyed S5. That said, I think the bit about the Romulans choosing a particular region of space because it would impede visual communication is just too contrived to be believable. It makes much more sense that they didn't communicate visually by choice and self-destructed their vessels to prevent boarding and capture, period. That's much easier to believe and far less contrived. Additionally, it would make for, IMO, an interesting story to have the Vulcans engaging in a passive cover-up regarding the enemy, simply not telling the rest of the alliance about their suspicions, but periodically dropping hints that they knew things that the others did not. With the recovery of Surak's teachings, that would make for a good storyline, with internal tensions on Vulcan as the High Command's old guard uses the war to reassert themselves and/or persuading the New Order not to tell the others in the alliance for fear that a backlash may occur with respect to the Andorians and the more xenophobic elements among the humans.