I don't remember it being fun in any way, no tactics necessary. For me the only viable strategy was: lie prone and shoot at the mindlessly charging enemies. After initially making a stealthy character I dumped that and restarted as a marksman - that way at least the fights didn't last that long and I could go on with the story which grabbed me until I realized that it really is THAT linear. Then I stopped.
All they had to do was sorta imitate the RT combat from Fallout Tactics - they implemented some good ideas there (ambushes and stealth was vital).
The things I liked were some of the quests, which sometimes were quite goofy, but I can see how that can fit adventure games.
All in all I'm just glad they didn't get the Fallout license back then, but this was all a publicity stunt anyway, wasn't it? And they seem to have learned quite a lot from The Fall. Developing RPGs is a bitch and they are better off (and better at) producing adventures.
To be fair I have to add that I was extremely hyped by The Fall. The last game I allowed myself to build my hopes up and I'm grateful for that lesson. On the one hand I might have enjoyed it more if that hadn't been the case. On the other hand I really wanted to enjoy the game with all the energy I put into getting attatched to the development process and hyping it myself (look at the last page in the manual, I'm up there in the special thanks list).