Quoted from NPO:
TWD is a players pin. If you are looking to appease family and friends, get a RFM, LW3, ACDC, JP, TZ, or TAF.
TWD and BSD are two of the most vicious and mean games out there. IM completes that trifecta of pain.
Despite what many seem to say here, I don't find BSD to be difficult or mean at all. Yes, if you make bad shots it often punishes you, but the good shots are easier to make and safer on the return than many made shots in TWD. TWD is "vicious and mean", making BSD look like child's play IMO. The layout (pops, drops, etc.) and magnets tend to deliver cheap drains more often than I'd prefer, but enough time with the game helps significantly. As a fairly average player myself, I'm not confidant I would have ever gotten to Horde if I didn't own the machine (especially with most location set ups). Once I finally got my skills up to where I could reach Horde, switching back to MET made me feel like I was invincible (I really can't believe how much TWD improved my ball control and consistency).
I currently have a Williams post sleeve to the left of the right ramp where the ball exits the pops (and a small piece of felt in the tunnel to make barn loops clean [took a couple tries to get it perfect]). Those modifications alone made the game considerably more fun, if perhaps slightly cheating in a way, but the pros outweigh the cons at home for me.
As others have noted, the double flip trick works wonders with the ball on the magnet. The way it responds feels like a feature to me. You can properly time your flip and hit the zombie, or do nothing/improperly time the shot and die. Once used to the timing, it's very consistent on my machine. Makes it feel like you're actively fighting against the zombie.
Ultimately, the game has very detailed rules (more than meets the eye at first) that take a longer time to understand than most. I personally have an issue getting into a new machine until I understand enough to make good shots and know where I'm headed for a good score. This just takes longer with TWD, and without some prior experience, I may agree with the OP that it perhaps isn't worth the cost to figure it out if there are other good games to play at the location. But as for owning it, I'd say it's entirely worth it as the mods to fix the issues noted can be done for under $2 to make the game play like it should have from the factory. After several custom audio changes, the game is the most immersive I've played (at least in regard to the Prem/LE).