ME1/2 could probably more be likened to STALKER than to Dragon Age. Don't get me wrong, Dragon Age is good, but its more of a modern tactical RPG, somewhat of a slightly parred down Baldur's Gate [Wish Bioware would get the Forgotten Realms license back tbh, they did some truly great things with it a decade ago, people still play BG today afterall.], and is quite traditional in its approach in that you really need to pause combat and plan frequently, especially if you're playing say a mage. ME tends to be a lot faster, as except for skills, typically in combat you wont need to pause very much etc
Adding my own 2 cents to the original question, yes ME1 is worth persevering with if you like the story, as in terms of RPG and story, it blows the second game out the water. ME2 has better combat, (although can get repetetive/obvious by the end) but in terms of exploration, size of areas, and overall story it pails in comparison to the first game.
If they could bring back more RPG, bigger story and areas, whilst streamlining useless equipment from ME1, and bring combat from the second game, with a reduction in obvious combat setups, then they'd have a truly excellent game. As it stands however, both ME1/2 are better at different things.
I hope ME3 is a refined join of the pair.