So I have been waiting to play classic mode (without the suit) since level 1. I just finished my first match and I have to say I was a little deflated (not jut because we lost). The gameplay is slow and somewhat tedious. The maps were designed for vertical movement and the possibility to avoid conflict. In classic mode, once your spotted it's pretty much the end. This brings up cloak (which I hated until I could recognize it) and the difference it makes in the original modes. Cloak allows players that more cautious by nature to "come out in the open". In classic mode we are right back at the old "defending a part of the map" (hiding in a corner or behind a bush). Also, without the suit the holder of the high ground (which is a game tactic) has a serious advantage being there are limited ways to access the location without being able to power jump . The weapon damage is the same with or without the suit, so the pace of the kills is no faster.
Since I don't have any regard for KD (or skills to back it up), I much prefer the ability to use the game to its full potential - jump, run, slide, kick etc versus just sneaking around (very limited sprint) looking at corners. Without the suit - Classic mode is just another FPS with some new maps. IMO.