While there are a number of issues I have with the fifth season (which I won't mention until JC has finished it, because of spoilers), I also think it contains a number of great storylines and character development. In particular, G'Kar and Londo continue to shine. Zack, Lyta, Lennier, Vir, and Garibaldi all get some great development. I wonder how much of this would have taken place in the non-rushed season five, as a good deal of it only works post-Shadow War.
Also, I'm a much bigger fan of Objects at Rest than Sleeping In Light, as far as endings go. In fact, I pretty much choose to ignore the last fifteen minutes of SIL with regards to B5 canon.