All in all, Level 5 is quite good. It's probably tied with Level 4 in terms of how much I personally like it. This was really the first level that I had to use my full arsenal of weapons to survive, rather than just blasting through it with just one gun. I think you'll enjoy it.
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On another topic, I'm in the mood now for a good RTS game, and am going to go buy one this weekend. I did some research to find some good games that will work on my PC. I narrowed it down to three choices:
Star Wars: Empire at War
Rome: Total War
Warhammer 40k: Dawn of War
(hmmm...they all have colons, and they all end in "war")
Which one should I pick up from these three?
I like the battles in rome total war, but the campaign in between bored me a bit, not sure why. I think it just wasn't as much fun as the battles.
Dawn of war was a bit different, I didn't play it too much, but was quite good in that building a decent base required you to take the fight to the enemy.
As to which I'd recommend, I'm not sure. I don't play many games very often, but I liked them both. Rome total war probably has the edge for me as the battles were too much fun, especially the few mulitplayer ones my friend and I played.