For being marketed as "the first commercial MOBA" it's not half bad for being as half-♥♥♥♥♥ as it is. You're right, it is pretty dynamic, not as challenging to pick up as Dota, and gives you some basic flexibility with your auto-throwaway units, which you can upgrade (along with towers) at your citadel. Despite there being only ten heroes, there's more gameplay options with the "generals" (spawn your own minions) or "assassin" (nuker) hero class categories.
That said, the game received no patches or additional content post-release. Even at
release, there were very, very few maps with no tutorial or story campaign. So, basically, you jump right in with NPC fights or buggy, laggy online games (which, as you might imagine, do not exist) with the same limited map pool. While the game had the capacity
for mod content, it's not like the Steak Workshop or Creator Kit was around when this came out, so there is no amateur content either to be found either unless you want some very basic UI tweaks.
I think, probably, the most aggravating part of this game is that what few maps there are don't really allow for progress like Dota does with one
map. It's like Unreal Tournament (2004), if you create a game with just AI players, you can stay at your base for five hours if you wanted to, come back, everything is exactly how it was when you left it. Heroes do not have as significant presence/impact without reaching the maximum level. The gameplay is just...bland. There's no hiding, very limited potential for ganking, no terrain advantages/disadvantages, hidden items...No meaningful progress happens on the map without steamrolling with sheer numbers and, even then, that progress is easily reversed back to a stalemate automatically by creeps in no time flat. Die, kill me, anything. Games HAVE to end at some point.
Whereas some really good older titles were given new patches and content by their publishers to bring them back to being contenders with Steam re-releases, this was an already mediocre game that did not get that attention.
This is just the absolute embodiment of lost potential.